Internet DRAFT - draft-chen-ati-ezipb
draft-chen-ati-ezipb
<Network Working Group> A. Y. Chen
Internet Draft R. R. Ati
Intended status: Experimental Avinta Communications, Inc.
Expires: May 2017
November 25, 2016
IPv4 with Adaptive Address Space
draft-chen-ati-ezipb-00.txt
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Abstract
This document describes a solution to the Internet address depletion
issue through the use of an existing Option mechanism that is part of
the original IPv4 protocol. This proposal, named EzIP (phonetic for
Easy IPv4), discusses the IPv4 public address pool expansion and the
Internet system architecture enhancement aspects. It was originated
by a study called ExIP (Extended IPv4) analyzing the use of the first
available octet (eight bits) in the reserved private network pools
(10/8, 172.16/12 and 192.168/16) to achieve a moderate address space
expansion factor of 256 by each, while maintaining their familiar
operation characteristics. Along the way, a parallel yet similar
effort, called EnIP (Enhanced IPv4), was discovered. EnIP fully
utilizes the same private network pools to increase the address space
by a factor of 17.1M with end-to-end connectivity. EzIP is a superset
that proposes one unified format for not only encompassing the
considerations of both, but also identifying additional capabilities
and flexibilities. For example, EzIP may expand an IPv4 address at
least by a factor of 256 to as high as 256M without affecting the
existing IPv4 public address assignments, while still keeping intact
the current private networks for the 256M case if desired. The EzIP
is in full conformance with the IPv4 protocol, and supports not only
both categories of connectivity, but also their interoperability. The
traditional Internet traffic and the IoT operations may coexist
simultaneously without perturbing their existing setups, while
offering end-users the freedom to choose one or the other. If the
IPv4 public pool were reorganized, the assignable pool could be
multiplied by 512M or even up to 2B times with end-to-end
connectivity. EzIP may be deployed as a firmware enhancement to the
Internet edge routers or private network gateways wherever needed, or
simply installed as an inline adjunct module between the two,
enabling a seamless introduction. The 256M case establishes a
spherical layer of routers providing a complete interconnection
between the Internet and end-users. This configuration enables the
entire current Internet and private networks characteristics to
remain intact. These proposed interim facilities would afford IPv6
more time to orderly reach the maturity and the availability levels
required for delivering a long-term general service.
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Table of Contents
1. Introduction...................................................4
1.1. Contents of this Draft....................................5
2. EzIP Overview..................................................6
2.1. EzIP Numbering Plan.......................................6
2.2. EzIP System Architecture.................................10
2.3. IP Header with Option Word...............................12
2.4. Examples of Option Mechanism.............................12
2.5. Basic EzIP Header........................................13
2.6. EzIP Operation...........................................15
2.7. Generalizing EzIP Header.................................15
3. EzIP Deployment Strategy......................................17
4. Updating Servers to Support EzIP..............................18
5. EzIP Enhancements.............................................19
6. Security Considerations.......................................23
7. IANA Considerations...........................................23
8. Conclusions...................................................23
9. References....................................................24
9.1. Normative References.....................................24
9.2. Informative References...................................24
10. Acknowledgments..............................................25
Appendix A EzIP System Architecture.............................26
A.1. EzIP System Part A.......................................26
A.2. EzIP System Part B.......................................26
A.3. EzIP System Part C.......................................27
A.4. EzIP System Part D.......................................28
Appendix B EzIP Operation.......................................30
B.1. Connection between EzIP-unaware IoTs.....................30
B.1.1. T1a Initiates a Session Request towards T4a.........30
B.1.2. RG1 Forwards the Packet to SPR1.....................31
B.1.3. SPR1 Sends the Packet to SPR4 through the Internet..31
B.1.4. SPR4 Sends the Packet to T4a........................32
B.1.5. T4a Replies to SPR4.................................33
B.1.6. SPR4 Sends the Packet to SPR1 through the Internet..33
B.1.7. SPR1 Sends the Packet to RG1........................34
B.1.8. RG1 Forwards the Packet to T1a......................34
B.1.9. T1a Sends a Follow-up Packet to RG1.................35
B.2. Connection Between EzIP-capable IoTs.....................35
B.2.1. T1z Initiates a Session Request towards T4z.........36
B.2.2. RG1 Forwards the Packet to SPR1.....................36
B.2.3. SPR1 Sends the Packet to SPR4 through the Internet..37
B.2.4. SPR4 Sends the Packet towards T4z to RG2............38
B.2.5. T4z Replies to SPR4.................................39
B.2.6. SPR4 Sends the Packet to SPR1 through the Internet..40
B.2.7. SPR1 Sends the Packet to RG1........................41
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B.2.8. RG1 Forwards the Packet to T1z......................42
B.2.9. T1z Sends a Follow-up Packet to RG1.................43
B.3. Connection Between EzIP-unaware and EzIP-capable IoTs....44
B.3.1. T1a initiates a request to T4z......................44
B.3.2. T1z initiates a request to T4a......................44
Appendix C Internet Transition Considerations...................46
C.1. EzIP Implementation......................................46
C.2. SPR Operation Logic......................................47
C.3. RG Enhancement...........................................48
1. Introduction
For various reasons, there is a large demand for IP addresses. It
would be useful to have a unique address for each Internet device,
such that if desired, any device may call any other. The Internet of
Things (IoT) would also be able to make use of more routable
addresses if they were available. Currently, these are not possible
with the existing IPv4 facility.
By Year 2020, the population and number of IoTs are expected to reach
7.6 billion and 50 billion respectively, according to a recent Cisco
online paper [1].
The IPv4 dot-decimal address format, consisting of four octets each
made of 8 binary bits, results in the maximum number of assignable
public addresses of 4.295 billion (calculated by 256 x 256 x 256 x
256, to be 4,294,967,296 - decimal exact). Using the binary /
shorthand notation of 64K representing 256 x 256 (decimal 65,536),
the full IPv4 address pool of 64K x 64K may be expressed as 4,096M,
or 4.096B. Clearly, the demand is more than 13 times over the
inherent capability available from the supply.
IPv6 with 128-bit hexadecimal address format offers a potential
solution to this problem, but its global adoption appears to face
certain challenges [2], [3]. Network Address and Port Translation
(NAPT - commonly known simply as NAT) on private networks together
with Carrier Grade NAT (CGNAT) over the Internet have been providing
the interim solutions thus far. However, NAT modules slow down
routers due to the state-table look-up process. As well, they only
allow an Internet session be initiated by their respective own
clients, impeding the end-to-end setup requests from remote devices
that certain IoT operations desire.
If the IPv4 capacity could be expanded to eliminate this address pool
deficiency while maintaining the familiar established operation
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conventions, and perhaps even offers reasonable reserve, the urgency
will be relaxed long enough for the IPv6 to mature on its own pace.
To increase the Internet public address pool, there have been various
proposals in the past. Among them, two recent efforts in particular
are referenced by this draft, namely ExIP and EnIP. The ExIP [4]
study focuses on reclaiming part of a reserved private network
address block, for example the third octet of 192.168/16, to be
publicly routable at the edge of the Internet. By making use of this
octet as semi-public address, the number of assignable public
addresses is increased by a factor of 256 to become 1049B which is
more than 20 times of the expected IoTs. This address expansion could
be implemented in an inline module called Semi-Public Router (SPR)
collocated with the Internet Edge Router (ER). Of course, the size of
the resultant private networks will be reduced accordingly.
The Enhanced IP (EnIP) [5] project proposes to increase the available
IPv4 public address space by a factor of 17.1M. Like IPv6, EnIP
results in full end-to-end connectivity among the enhanced addresses.
The EnIP implementation module, "NAT and EnIPNAT/translator",
replacing existing private network gateway, is very similar to the
SPR.
EzIP merges these two schemes into one uniform solution. Neither
Internet Core (/ backbone) Router (CR), nor private network Routing
Gateway (RG) needs to handle the Options added to the resultant IP
header, since their designs recognize and preserve this Option
mechanism, yet are not programmed to process the specific EzIP
information. Even the Edge Routers (ER) may stay unchanged, if the
SPR is deployed with the adjunct configuration during the
introductory phase.
The assignable IPv4 compatible public address pool may be expanded
significantly more upon incorporating other available IPv4 resources
by the EzIP technique, as discussed in the latter part of this
document.
1.1. Contents of this Draft
The rest of this draft begins with outlining the EzIP numbering plan.
A modified IP header called EzIP header is introduced for carrying
the EzIP address data in the Option words. The overview of the
Internet architecture as the result of being expanded by the EzIP
scheme, the EzIP header transitions through various routers and the
operation considerations are discussed next, with details presented
in Appendices A, B and C, respectively. Utilizing the EzIP approach,
a range of possibilities of expanding the publicly assignable IPv4
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address pool as well as enhancing the Internet operation flexibility
are then described.
2. EzIP Overview
2.1. EzIP Numbering Plan
The ExIP technique which is the foundation of the EzIP plan began
with making use of the reserved private network address pools in very
much the same manner as Private Automatic Branch eXchange (PABX)
telephone switching machines utilizing locally assigned "extension
numbers" to expand the Public Switched Telephone Network (PSTN)
capacity by replicating a public telephone line to multitudes of
reusable private telephone numbers, each to identify a local
instrument. At the first sight, this may seem odd, because the
extension numbers of a PABX belong to a separate set from that of the
public telephone numbers, while private network IP address is a
specific subset reserved from the overall IPv4 pool that is otherwise
all public. However, recognizing that neither of the latter two is
allowed to operate in the other's domain suggests that the proposed
EzIP numbering system indeed may mirror the telephony case. In fact,
the very basic form of the EzIP numbering is to make explicit the
familiar subnetting process of 192.168/16 that has been performed
routinely by consumer RGs (Residential / Routing Gateways) on
residential premises for a long time.
2.1.1. To facilitate the following discussions, the 32 bits in a
private network address notation are divided into three parts, namely
Network, Extension and IoT No.'s as shown in Figure 1 below.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Network No. - Extension No. : IoT No. |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1 EzIP Address Notation (Generic)
The number of bits in the Extension No. part determines the
multiplication factor to be applied by the EzIP process. The trailing
IoT No. bits determine the size of the resultant private network. The
Network No. part is the specific binary value of the remaining
leading bits (the prefix) identifying an address block that will be
reserved from the public IPv4 pool.
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2.1.2. Following the general concept of subnetting, the unit for
expanding an address does not need to be restricted to the boundary
of an octet. This allows potentially finer grain resolution.
2.1.3. How to utilize the 32 bits leads to tradeoffs among EzIP
operation characteristics. For example, maintaining the private
network properties or establishing the end-to-end connectivity is
just a matter of whether there are bits reserved for the IoT No.
2.1.4. This notation may be used to present two general categories
of EzIP address expression:
A. To retain the private network characteristics, the EzIP
subnetting makes use of only the first available octet. For the
common three private network address pools, we will have the
following:
In Figure 2, 8 bits are available for IoT No., resulting in private
networks each capable of 256 IoTs.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 192.168 - Extension No. : IoT No. |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2 EzIP-1 (8 bits of 192.168/16 semi-publicly addressable)
In Figure 3, 12 bits are available for IoT No., resulting in private
networks each capable of 4K IoTs.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 172.16 - Extension No. : IoT No. |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 3 EzIP-2 (8 bits of 172.16/12 semi-publicly addressable)
In Figure 4, 16 bits are available for IoT No., resulting in private
networks each capable of 64K IoTs.
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 10 - Extension No. : IoT No. |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 4 EzIP-3 (8 bits of 10/8 semi-publicly addressable)
B. To allow direct access from the Internet, EzIP makes use of all
available bits in a reserved private network address as Extension
No., leaving no bit for the IoT No. The resultant private network
will have no RG, but only one IoT that is directly connected to the
Internet:
In Figure 5, 16 bits are assigned for Extension No., resulting in 64K
IoTs directly addressable from the Internet.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 192.168 - Extension No. |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 5 EzIP-4 (16 bits of 192.168/16 semi-publicly addressable)
In Figure 6, 20 bits are assigned for Extension No., resulting in
1M IoTs directly addressable from the Internet.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 172.16 - Extension No. |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 6 EzIP-5 (20 bits of 172.16/12 semi-publicly addressable)
In Figure 7, 24 bits are assigned for Extension No., resulting in 16M
IoTs directly addressable from the Internet.
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 10 - Extension No. |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 7 EzIP-6 (24 bits of 10/8 semi-publicly addressable)
For cross reference purpose, EzIP-1 through EzIP-3 are the same
numbering types used by the ExIP study, while EzIP-4 through EzIP-6
are used by the EnIP project.
Figure 8 summarizes the number of possible publicly and privately
assignable addresses for each original IPv4 public address under
different configurations.
| 192.168/16 | 172.16/12 | 10/8 |
==============+===============+================+==============+
Basic IPv4 | | | |
--------------+---------------+----------------+--------------+
Address Bits* | 32 | 32 | 32 |
--------------+---------------+----------------+--------------+
Public | 1 | 1 | 1 |
Private | 64K | 1M | 16M |
==============+===============+================+==============+
(ExIP) | EzIP-1 | EzIP-2 | EzIP-3 |
--------------+---------------+----------------+--------------+
Address Bits* | 40 | 40 | 40 |
--------------+---------------+----------------+--------------+
Semi-Public | 256 | 256 | 256 |
Private | 256 | 4K | 64K |
==============+===============+================+==============+
(EnIP) | EzIP-4 | EzIP-5 | EzIP-6 |
--------------+---------------+----------------+--------------+
Address Bits* | 48 | 52 | 56 |
--------------+---------------+----------------+--------------+
Public | 64K | 1M | 16M |
Private | 1 | 1 | 1 |
==============+===============+================+==============+
Notes:
a. * -- Effective Overall Public Address Length
b. For each Public-Private pair, the numbers of addresses are
multiplicative, not additive.
Figure 8 IPv4 Address Expansion Configurations
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2.2. EzIP System Architecture
With six basic EzIP expansion types, it is difficult to include them
all in one single system architecture diagram. To facilitate the
presentation, a partial system diagram covering only the 192.168/16
(EzIP-1 and EzIP-4) portion as presented below will be utilized for
the discussions that follow. A complete set of system architectural
diagrams is presented in Appendix A.
+------+
Web Server | WS0z |
+--+---+
|69.41.190.145
|
| +-----+
+--+ ER0 |
+--+--+
|
+------+-------+
+-------+ Internet +--------+
| |(Core Routers)| |
+--+--+ +--------------+ +--+--+
+-----+ ER1 | +-----+ ER4 |
| +-----+ | +-----+
| |
EzIP-1 |69.41.190.110 EzIP-4 |69.41.190.148
+--+--+ +--+--+
+-----------+ +-------+ +---------+ +------+
| +-----+ SPR1| | | +-----+ SPR4+--+ |
| | +-----+ | | | +-----+ | |
| 192.168.2.0 ... 192.168.255.0 | | | |
+-----+ |...| |...|
|192.168.1.0 | | +---------+ |
+--+--+ | | | |
+---+ RG1 +--+ 192.168.0.1 | | 192.168.255.255
| +-----+ | | |
| Premises 1 | +----------+ |
| | | Premises 4 |
|192.168.1.3 |192.168.1.9 |192.168.4.10 |192.168.4.40
+--+--+ +--+--+ +--+--+ +--+--+
| T1a | .... | T1z | | T4a | ....... | T4z |
+-----+ +-----+ +-----+ +-----+
Figure 9 EzIP System Architecture-A (192.168/16 Portion)
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+--------------------------+-----------------+----------------+
| | Basic IPv4 | EzIP-capable |
+--------------------------+-----------------+----------------+
| Internet Edge Router (ER)| ER0, ER1, ER4 | ------------ |
+--------------------------+-----------------+----------------+
| Internet of Things (IoT) | T1a, T4a | T1z, T4z |
+--------------------------+-----------------+----------------+
| Routing Gateway (RG) | RG1 | ------------ |
+--------------------------+-----------------+----------------+
| Semi-Public Router (SPR) | ------------- | SPR1, SPR4 |
+--------------------------+-----------------+----------------+
| Web Server (WS) | ------------- | WS0z |
+--------------------------+-----------------+----------------+
Figure 10 EzIP-1 & EzIP-4 Components
2.2.1. Referring to the left portion labeled EzIP-1 of Figure 9,
instead of assigning each premises a public IPv4 address as in the
current practice, an SPR like SPR1, is inserted between an Internet
Edge Router (ER1) and its connections to private network Routing
Gateways like RG1, for utilizing the third octet, such as
192.168.nnn/24 (nnn = 0 through 255) to identify respective entities.
The RG1 serves either a LAN or a HAN. On each LAN / HAN, the fourth
octet "mmm" of 192.168.nnn.mmm/32 continues to be used by the RG1 to
identify the IoTs it serves. This is how common RGs are being
configured today anyway (Factory default values of nnn are usually 0,
1, 2, 10, etc.)
2.2.2. The right portion of Figure 9 is labeled EzIP-4. Here SPR4
assigns the full range of the available 192.168/16 IP addresses (the
third and fourth octets) individually to T4a through T4z.
Consequently, these IoTs are directly accessible from any remote
device on the Internet.
2.2.3. Since the existing physical connections to subscriber's
premises do appear at the ER, it is natural to have SPRs be
collocated with their ER. It follows that the simple routing function
provided by the new SPR modules may be absorbed into the ER through a
straightforward operational firmware enhancement. Consequently, the
public - private demarcation line will remain at the RG where
currently all utility services enter a subscriber's premises.
2.2.4. To identify each of these devices, we may use a three part
address format "IPv4 - Semi-Public: TCP Port No.". The following is
how each of the IoTs in Figure 9 may be identified.
RG1: 69.41.190.110-192.168.1.0
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T1a: 69.41.190.110-192.168.1.0:3
T1z: 69.41.190.110-192.168.1.0:9
T4a: 69.41.190.148-192.168.4.10
T4z: 69.41.190.148-192.168.4.40
Note that to simplify the presentation, it is assumed at this
juncture that the conventional TCP (Transmission Control Protocol)
[6] Port Number, normally assigned to T1a and T1z by RG1's NAT module
upon initiating a session, equals to the fourth octet of that IoT's
private IP address that is assigned by the RG1's DHCP (Dynamic Host
Configuration Protocol) [7] module as ":3" and ":9", respectively.
Such numbers are unique within each respective private network. They
are adequate for the discussion purpose here. However, considering
security, as well as allowing each IoT to have multiple simultaneous
sessions, etc., this direct correlation shall be avoided in actual
practices by following the NAT operation conventions as depicted by
the examples in Error! Reference source not found..
2.3. IP Header with Option Word
To transport the EzIP Extension No., we will make use of the Option
word in the IP header as defined in Figure 9 of [RFC791] [8]. This
mechanism has been used for various cases in the past. Since they
were mostly for utility or experimental purposes, however, their
formats may be remote from the incident discussion.
2.4. Examples of Option Mechanism
The following two cases specifically deal with the address pool
issues. They are referenced here to facilitate the appreciation of
the Option mechanism.
A. EIP (Extended Internet Protocol) - [RFC1385] [9] (Assigned but
now deprecated Option Number = 17) by Z. Wang: This approach
attempted to add a new network layer on top of the existing Internet
for increasing the addressable space. Although equipment near the
end-user would stay unchanged, equipments around the Internet Core
Routers (CR) apparently had to go through rather involved upgrade
procedures.
B. EnIP (Enhanced IPv4) - Internet Draft [5] (temporarily
utilizing Option Number = 26) by W. Chimiak: This work makes use of
the reserved private network addresses to extend the public pool by
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trading the private network operation for end-to-end connectivity.
The EnIP and ExIP approaches closely resemble each other.
2.5. Basic EzIP Header
The basic EzIP header format uses the Option ID field to convey the
value of the "Network No." as well as the length of the "Extension
No.". This header has the capacity to handle up to two octets of the
"Extension No." on either end of a connection.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (7)|Type of Service| Total Length (28) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | Extended |
6 | (Source) | Option Length | Source | Source |
| (------) | (4) | No.-1 | No.-2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | Extended |
7 | (Destination) | Option Length | Destination | Destination |
| (------) | (4) | No.-1 | No.-2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 11 Basic EzIP Header (Two Octet)
For transporting an IP header for T4z at the Source end and RG1 at
the Destination end, Figure 12 depicts an EzIP header example:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (7)|Type of Service| Total Length (28) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.110) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP-4 | EzIP | Extended | Extended |
6 | (Source) | Option Length | Source | Source |
| (0X9A) | (4) | No. (4) | No. (40) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP-1 | EzIP | Extended | End of |
7 | (Destination) | Option Length | Destination | Option List |
| (0x9B) | (3) | No. (1) | (00000000) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 12 EzIP Header Example 1
Note that the Option IDs 0x9A (Option Number = 26) and 0x9B (Option
Number = 27), both representing Network No. 192.168/16 while
conveying the Extension No.'s being two and one octet, respectively,
in the above figure, are arbitrarily chosen from the currently
available Option Numbers list [10]. Since RG1 extension No. has only
one octet, the "End of Option list" Option is used to fill up word 7.
If the transmission direction is reversed, types of EzIP extension
used by the Source and the Destination will be interchanged as well.
The unused octet will now be at the end of word 6. The "No Operation"
Option should be used as the filler shown in Figure 13:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (7)|Type of Service| Total Length (28) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number 69.41.190.110) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | No |
6 | (Source) | Option Length | Source | Operation |
| (0X9B) | (3) | No. (1) | (00000001) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | Extended |
7 | (Destination) | Option Length | Destination | Destination |
| (0x9A) | (4) | No. (4) | No. (40) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 13 EzIP Header Example 2
2.6. EzIP Operation
With half a dozen of EzIP types, it would be very tedious and
distracting to go through all combinations of IP header
configurations and their transitions through the network. To convey
the general scheme, Error! Reference source not found. presents
examples of EzIP header transitions through routers among IoTs having
EzIP-1 and EzIP-4 types of addresses, with and without EzIP
capability.
To introduce the EzIP approach into an environment where EzIP-unaware
IoTs like T1a and T4a will be numerous for a long time to come, a SPR
must be able to follow certain decision rules to determine which type
of service to provide for achieving a smooth transition. Appendix C
outlines such logic and related considerations.
2.7. Generalizing EzIP Header
2.7.1. The basic EzIP header shown in Figure 11 with up to two
octet Extension No. format is not capable of EzIP-5 and EzIP-6 types
with 20 and 24 bit, respectively. One extra octet is needed on each
end of a connection. An additional word in the header, however, will
have only two octets unused. To take advantage of this spare
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resource, we might as well consider a header format shown in Figure
14 that can transport the full 4 octet (32 bit) extension addresses
of both ends. This is similar as the EnIP header [5], except more
flexible by allowing EzIP type being independent of that at the other
end.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (8)|Type of Service| Total Length (32) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | Extended |
6 | (Source) | Option Length | Source | Source |
| (0X9A) | (6) | No.-1 | No.-2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Extended | Extended | EzIP ID | EzIP |
7 | Source | Source | (Destination) | Option Length |
| No.-3 | No.-4 | (0X9A) | (6) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Extended | Extended | Extended | Extended |
8 | Destination | Destination | Destination | Destination |
| No.-1 | No.-2 | No.-3 | No.-4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 14 Full EzIP Header (Four octet)
2.7.2. In brief, Figure 12 or Figure 13 with seven words (40%
overhead) having two octet capacity is suitable to transport EzIP-1
through EzIP-4 types consisting of one or two octet Extension No.
EzIP-5 and EzIP-6 require the next IP header size which is eight
words (60% overhead) as shown in Figure 14.
2.7.3. Being a superset, utilizing "No Operation" or "End of Option
List" type of fillers, Figure 14 is capable of handling information
for EzIP-1 through EzIP-4 just as well. The question then becomes;
whether the extra 20% overhead when handling EzIP-1 through EzIP-4
headers is tolerable? If so, the single Figure 14 format may be used
for all EzIP cases.
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2.7.4. With the "Network No." prefixes of the well-know private
network addresses all explicitly carried by the IP header of every
packet as shown in Figure 14, the Option Number only needs to
identify the length of the "Extended No.". Consequently, one Option
Number is sufficient to represent EzIP-1 through EzIP-3 that only the
first available octet is used for the Extension No. Similarly, one
single Option Number representing EzIP-4 through EzIP-6 conveys the
condition that all available bits are to be used for Extension No.
2.7.5. One potential drawback of the full four octet EzIP header is
that it may cause Internet routers to intercept a packet for
containing a disallowed (private network) IP address, although
positioned at a location of the header normally not designated for
address information.
2.7.6. By harmonizing EzIP-4 to -6 (EnIP) with EzIP-1 to -3 (ExIP)
into one common (EzIP) format, enjoying which operating
characteristics will simply be the result of a user subscribing to an
EzIP address type appropriate for how he wishes to use his IoT.
3. EzIP Deployment Strategy
Although the eventual goal of the SPR is to support both web server
access by IoTs from behind private networks and direct end-to-end
connectivity between IoTs, the former application should be addressed
first to immediately relieve the basic address shortage issue. Once
the IoTs on both ends of an intended connection are served by SPRs,
it will be natural to realize the latter.
A. Architecturally
Since the design philosophy of the SPR is an inline module between
the Internet ER (Edge Router) and the private network RG (Routing
Gateway), SPR introduction process may be flexible.
A.1. SPRs may be collocated with ERs to begin providing the CGNAT
equivalent function. This may be done immediately without affecting
the existing Internet (edge and core) routers. EzIP-capable IoTs
will then take advantage of the faster bi-directional routing
services through the SPRs by initiating a communication session with
an EzIP header.
A.2. Alternatively, a SPR may be deployed as an adjunct module
before an existing RG to realize the same EzIP functions on private
premises, even if the serving Internet Service Provider (ISP) has not
enhanced ERs with the EzIP capability. This empowers individual
subscribers to enjoy the new EzIP capability on their own.
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B. Functionally
B.1. First, an ISP should install SPRs in front of business web
servers so that new routing branches may be added to support the
additional web servers for expanding business activities.
Alternatively, this may be achieved by deploying new web servers with
the SPR function built-in.
B.2. On the subscriber side, SPRs should be deployed to relieve
the public address shortage issue, and to facilitate the access to
new web servers.
C. Permanently
In the long run, it would be best if SPRs are integrated into ERs by
upgrading the latter's firmware to minimize the hardware.
Appendix C details the considerations in implementing these outlines.
4. Updating Servers to Support EzIP
Although the IP header Option mechanism utilized by EzIP was defined
a long time ago as part of the original IPv4 protocol, it has not
been used much in daily traffic. Certain current Internet facilities
were thus optimized without considering the Option mechanism. They
need be adjusted to provide the same performance to EzIP packets.
There are also utility type of servers need be updated to support the
longer EzIP address. For example;
A. Fast Path
Internet Core Routers (CRs) are currently optimized to only provide
the "fast-path" (through hardware line card) routing service to
packets without Option word in the IP header [11]. This puts EzIP
packets in a disadvantage, because EzIP packets would be put through
the "slow path" (processed by CPU's software before giving to the
correct hardware line card to forward), resulting in a slower
throughput. Since the immediate goal of the EzIP is to ease the
address pool exhaustion issue, subscribers not demanding for high
performance traffic may be assigned with the facility provided
through EzIP. This gives time for Internet routers to update so that
EzIP packets with authorized Option numbers will eventually be
recognized for receiving the "fast-path" service.
B. Connectivity Verification
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One frequently used utility for verifying baseline connectivity,
commonly referred to as the "PING" function in PC terminology, needs
be able to transport the full EzIP address that is longer than the
standard 32 bit IPv4 address. There is an example of an upgraded TCP
echo server in [RFC862] [12].
C. Domain Name Server (DNS)
Similarly, the DNS needs to expand its data format to transport the
longer IP address created by EzIP. This already can be done under
IPv6. Utilizing the experimental IPv6 prefix 2001:0101 defined by
[RFC2928] [13], EzIP addresses may be transported as standardized
AAAA records.
These topics are discussed in more detail under the IETF Draft RFC,
Enhanced IPv4 - V.03 [5].
5. EzIP Enhancements
To minimize disturbing any assigned addresses, deployed equipment and
current operation procedures, etc., the EzIP derivations so far are
conducted under the constraint of utilizing only the existing three
reserved private network address blocks. Beyond such, there are other
possibilities. In the long run, EzIP may significantly expand the
current IPv4 public address pool through the employment of such
additional resources outlined below.
A. In reviewing the IP Option Number assignments [10], it is
discovered that more than a dozen of them are currently available.
That is, besides five numbers, 26, 27, 28, 29 & 31 that have never
been assigned, there are eleven numbers assigned earlier but have
been deprecated due to the end of associated experiments. If we take
six such numbers, one to represent each of the six EzIP extension
types, the EzIP-1 to EzIP-3 cases will multiply the IPv4 public
address pool by a factor of 256, individually, or a combined factor
of 768, resulting in 3,145.728B, or 3.146KB publicly assignable
addresses. Similarly, we can use one Option Number for each of the
EzIP-4, -5 and -6 cases to multiply IPv4 pool by 64K, 1M and 16M (a
total of 17.1M) fold, respectively, to the combined total of 69.894MB
addresses. These capacities are over 63 and 1.4M times of the
expected Year 2020 IoTs, respectively.
B. EzIP-8: If all Option numbers were made available, each
representing one EzIP Network No. prefix, up to 32 private network
address blocks, like the 10/8 could be utilized by EzIP. To determine
the upper limit of this scenario, let's assume that we could employ
31 additional 10/8 type address blocks, say by re-designating 11/8
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through 41/8 as private network blocks. These enable us to expand
each existing IPv4 public address by 32 x 16M or 512M fold. Since
this block of 512M addresses have to be removed from the basic public
pool, the resulting total addresses will be (4.096B - 512M) x 512M,
or 1,835MB. This is over 35M times of the predicted number of IoTs
(50B) by Year 2020. It certainly has the capacity to deal with the
short- to mid- term public IP address needs.
C. The above may be condensed for a more efficient operation. For
example, a single 224/3 block contains the same amount of 512M
addresses may be chosen upon re-allocation of currently assigned IPv4
public addresses so that just one Option Number may represent it. Now
that we have freed up 31 Option numbers, we could allocate up to 31
more /3 address blocks for EzIP operation that provides even more
extension address resource. However, this last step will exceed the
total capacity of the IPv4 pool. On the other hand, this line of
reasoning leads to the next observation.
D. EzIP-9: One interesting consequence of the EzIP header in Figure
144 capable of transporting the full 32 bit private network address
is that the Extension No. may be as long as practical. That is, we
can go to the extreme of reserving only one bit for the Network No.,
and leaving nothing for the IoT No. With these criteria, the current
IPv4 pool may be divided into two halves, reserving one half of it
(about 2B addresses) as a private network with prefix equal to "1" as
the Network No., and all trailing 31 bits designated as Extension No.
Each of the remaining 2B addresses (with prefix equals to "0") of the
basic IPv4 pool may then be expanded 2B times through the EzIP
process, resulting in a total of 4BB addresses that are IPv4
compatible and capable of full end-to-end connectivity. This is
roughly 80M times of the Year 2020 IoTs.
E. EzIP-7: On the other hand, this full 32 bit EzIP addresses
transport facility may be applied to the elusive IPv4 240/4 block
(240/8 - 255/8) consisting of 256M addresses that has become
"RESERVED for Future use" [14] as the result of the historical
address assignment evolution. Since this block is not suitable for
being used as public address, it might as well be re-classified as an
additional (the fourth) reusable private network pool. Then, the SPR
may use this block as the extension address pool in the EzIP process.
Following this approach, each current IPv4 public address may be
multiplied by 256M times based on only one Option Number. Since the
240/4 block could not be used for public addressing, the size of the
publicly assignable IPv4 pool has actually been only 3.84B (4.096B -
256M). So, the net public addressable pool created from this approach
is 983MB (3.84B x 256M), which is over 19.6M times of the expected
Year 2020 IoTs. This scheme is very close to EzIP-8. Although half of
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the capacity, this manifestation has the advantage of circumventing
reassignment of public IPv4 addresses.
The following compares various IPv4 public address pool expansion
configurations.
| Extension |Option|Effect. |Expansion|Assignable| SUP/|Connect- |
| Scheme | Used | AddBits| Factor | Pub Add | DMD | ivity |
+=============+======+========+=========+==========+=====+=========+
| IPv4 Public Address Block Assignments Unchanged |
+---+---------+------+--------+---------+----------+-----+---------+
| E | EzIP-1 | 1 | 40 | 256 | 978.69B | 19.6| PrivNet |
| x +---------+------+--------+---------+----------+-----+---------+
| I | EzIP-2 | 1 | 40 | 256 | 978.69B | 19.6| PrivNet |
| P +---------+------+--------+---------+----------+-----+---------+
| | EzIP-3 | 1 | 40 | 256 | 978.69B | 19.6| PrivNet |
+---+---------+------+--------+---------+----------+-----+---------+
| E | EzIP-4 | 1 | 48 | 64K | 244.67KB | 5K |EndToEnd |
| n +---------+------+--------+---------+----------+-----+---------+
| I | EzIP-5 | 1 | 52 | 1M | 3.82MB | 77K |EndToEnd |
| P +---------+------+--------+---------+----------+-----+---------+
| | EzIP-6 | 1 | 56 | 16M | 61.17MB | 1M |EndToEnd |
+---+---------+------+--------+---------+----------+-----+---------+
|EzIP-7(240/4)| 1 | 64 | 256M | 978.69MB | 20M |EndToEnd |
+=============+======+========+=========+==========+=====+=========+
| IPv4 Public Address Block Assignments Adjusted |
+-------------+------+--------+---------+----------+-----+---------+
| EzIP-8 | | | | | | |
| (224/3) | 1 | 56 | 512M | 1.84BB | 37M |EndToEnd |
+-------------+------+--------+---------+----------+-----+---------+
| EzIP-9 | | | | | | |
| (Half of | 1 | 63 | 2B | 4BB | 80M |EndToEnd |
| IPv4 Pool) | | | | | | |
+=============+======+========+=========+==========+=====+=========+
Notes:
a. EzIP-1 through EzIP-7 Assignable Public Addresses calculated with
the net basic IPv4 public address pool of 3.823B after removed the
240/4, 10/8, 172.16/12 and 192.168/16 blocks from the basic 4.096B
b. EzIP-8 and EzIP-9 Assignable Public Addresses calculation started
from scratch based on the full IPv4 pool of 4.096B minus only the
specific portion used for extension purpose
c. "SUP/DMD": Ratio of EzIP SUPplied publicly assignable addresses to
IoT DeManD by Year 2020
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d. Each group of EzIP-1 to -3 and EzIP-4 to -6 may use only one
Option number if "four octet" EzIP headers are used.
Figure 15 IPv4 Address Multiplication Factors
F. It is important to note that schemes summarized in Figure 15 are
not mutually exclusive but mostly complementary. Except the last two
cases (EzIP-8 and EzIP-9) that are intend to demonstrate the
potential public address sizes by starting from the full 4.096B IPv4
pool ignoring the current assignments and reservations, EzIP-1
through EzIP-7 may be applied to the same public IPv4 address since
they are distinguished from one another by the Option Numbers
representing the network prefix and the number of Extension No. bits.
These enable an ISP to offer a rich mixture of addresses for the
subscribers to choose from.
G. An address extended by EzIP-4 through EzIP-7 directly connecting
an IoT to the Internet could nevertheless be replaced by a private
network established through an RG as described at the end of Appendix
B. The EzIP-7 can best take advantage of this approach, because the
240/4-address block is totally segregated from the three conventional
private network pools, thus avoiding confusing the Internet routers.
Essentially, the subscribers, appearing as private networks and
directly connected IoTs, will interface with a complete spherical
layer of secondary ERs (made of the SPRs) that wraps the entire
existing Internet within by utilizing a never assigned address pool.
H. In summary, the EzIP technique may expand the current IPv4 public
address pool with a wide range of multiplication factors. It may be
256 folds while maintaining the current private network properties
except with reduced size, and from 64K to 256M folds while offering
direct end-to-end connectivity. In addition, multiplication factor of
512M may be achieved with some re-assignments of the IPv4 blocks.
Lastly, the address capacity could even become 1B times of the
current 4B pool with fully direct end-to-end connectivity. However,
these last two EzIP manifestations rely on significant realignments
of the current address blocks. In between, we could have an IPv4
based Internet that can simultaneously support private networks along
with directly accessible IoTs for interconnectivity and
interoperability.
I. Overall, EzIP-7 may be the optimum choice. It utilizes a block of
IPv4 addresses that could not be assigned as public identifiers
anyway. It needs only one Option Number. Furthermore, existing
private network setups may remain intact. Essentially, EzIP-7
introduces a new layer of routers (made of the SPRs) that expands the
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Internet address capacity by 256M fold uniformly, with minimum
disturbance to the current Internet operations.
6. Security Considerations
The EzIP solution is based on an inline module called SPR that
intends to be as transparent to the Internet traffic as possible.
Thus, no overall system security degradation is expected.
7. IANA Considerations
This draft does not create a new registry nor does it register any
values in existing registries; no IANA action is required.
8. Conclusions
This draft RFC describes an enhancement to IPv4 operation utilizing
IP header Option mechanism. Because the design criterion is to
enhance IPv4 by extending instead of altering it, the impact on
already in-place routers and security mechanisms is minimized.
To resolve the IPv4 public address pool exhaustion issue, a technique
called EzIP (phonetic for Easy IPv4) making use of the reserved
private network address blocks is proposed.
The basic EzIP intention is to maintain the existing private network
configuration. If an Extension No. for EzIP is chosen from the very
end of the 32 bit reserved private network address, leading to no
address bit available to assign on the resultant network, the IoT
being served is directly accessible from any remote device in the
Internet. An IoT may communicate through the Internet with either
type of the connectivity, depending on which type of extension
address its owner wishes to subscribe and to utilize with.
The basic EzIP header uses two added words (or 40% overhead) to the
IP header for transporting two octets of an Extension No. To carry
the full four octet EzIP extension address, a third added word is
needed resulting in a 60% overhead. The latter, being a superset of
the former, may be used for all EzIP cases if the extra 20% overhead
is tolerable for cases when the larger capacity is not necessary.
At the extreme end of the spectrum, the EzIP scheme could be
configured to support an IPv4 compatible pool of up to 4BB addresses
with full direct end-to-end connectivity.
Last but not the least, the "RESERVED for Future use" 240/4 block may
be re-classified as the fourth reusable private network pool, so that
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the SPR may use it as the EzIP extension address. This pool can
multiply each current IPv4 public address by 256M times based on only
one Option Number, while all existing subscriber premises setups
(private networks and directly connected IoTs) may remain unchanged.
This manifestation of EzIP technique may be the optimal solution to
our needs.
9. References
9.1. Normative References
(None)
9.2. Informative References
[1] https://nishithsblog.files.wordpress.com/2014/04/internet-of-
things-market-forecast.jpg
[2] http://stats.labs.apnic.net/ipv6
[3] https://ams-ix.net/technical/statistics/sflow-stats/ether-type
[4] http://www.avinta.com/phoenix-1/home/IETF-Draft-ExIP.pdf
[5] https://tools.ietf.org/html/draft-chimiak-enhanced-ipv4-03
[6] https://tools.ietf.org/html/rfc793
[7] https://www.ietf.org/rfc/rfc2131.txt
[8] https://tools.ietf.org/html/rfc791
[9] https://tools.ietf.org/html/rfc1385
[10] http://www.iana.org/assignments/ip-parameters/ip-
parameters.xhtml
[11] http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.477.19
42&rep=rep1&type=pdf
[12] https://tools.ietf.org/html/rfc862
[13] https://tools.ietf.org/html/rfc2928
[14] http://www.iana.org/assignments/ipv4-address-space/ipv4-
address-space.xhtml
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10. Acknowledgments
The authors would express their deep appreciation to Dr. W. Chimiak
for the enlightening discussions about his team's efforts and
experiences through the EnIP development.
This document was prepared using 2-Word-v2.0.template.dot.
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Appendix A EzIP System Architecture
A.1. EzIP System Part A
The EzIP-1 and EzIP-4 portions of the EzIP system has already been
shown as Figure 9 in the main body of this Draft document.
A.2. EzIP System Part B
The EzIP-2 portion maintains private network operation
characteristics, while EzIP-5 portion delivers end-to-end
connectivity.
+------+
Web Server | WS0z |
+--+---+
|69.41.190.145
|
| +-----+
+--+ ER0 |
+--+--+
|
+------+-------+
+-------+ Internet +--------+
| |(Core Routers)| |
+--+--+ +--------------+ +--+--+
+-----+ ER2 | +-----+ ER5 |
| +-----+ | +-----+
EzIP-2 |69.41.190.120 EzIP-5 |69.41.190.158
+--+--+ +--+--+
+-----------+ +-------+ +---------+ +------+
| +-----+ SPR2| | | +-----+ SPR5+--+ |
| | +-----+ | | | +-----+ | |
| | ................. | |...| |...|
172.16.1.0 |172.16.2.0 172.31.240.0 | | +---------+ |
+--+--+ | | | |
+---+ RG2 +--+ 172.16.1.0 | | 172.31.255.255
| +-----+ | | |
| Premises 2 | +----------+ |
| | | Premises 5 |
|172.16.2.3 |172.16.2.9 |172.16.5.10 |172.16.5.40
+--+--+ +--+--+ +--+--+ +--+--+
| T2a | .... | T2z | | T5a | ....... | T5z |
+-----+ +-----+ +-----+ +-----+
Figure 16 EzIP System Architecture-B (172.16/12 Portion)
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A.3. EzIP System Part C
The EzIP-3 portion maintains private network operation
characteristics, while EzIP-6 portion delivers end-to-end
connectivity.
+------+
Web Server | WS0z |
+--+---+
|69.41.190.145
|
| +-----+
+--+ ER0 |
+--+--+
|
+------+-------+
+-------+ Internet +--------+
| |(Core Routers)| |
+--+--+ +--------------+ +--+--+
+-----+ ER3 | +-----+ ER6 |
| +-----+ | +-----+
| |
EzIP-3 |69.41.190.130 EzIP-6 |69.41.190.160
+--+--+ +--+--+
+-----------+ +-------+ +---------+ +------+
| +-----+ SPR3| | | +-----+ SPR6+--+ |
| | +-----+ | | | +-----+ | |
| ... | ................. | | | | |
| | | |...| |...|
10.1.0.0 |10.3.0.0 10.255.0.0 | | +---------+ |
+--+--+ | | | |
+---+ RG3 +--+ 10.1.0.0 | | 10.255.255.255
| +-----+ | | |
| Premises 3 | +----------+ |
| | | Premises 6 |
|10.3.0.3 |10.3.255.9 |10.6.0.10 |10.6.0.40
+--+--+ +--+--+ +--+--+ +--+--+
| T3a | .... | T3z | | T6a | ....... | T6z |
+-----+ +-----+ +-----+ +-----+
Figure 17 EzIP System Architecture-C (10/8 Portion)
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A.4. EzIP System Part D
Utilizing 240/4, the EzIP provides a "spherical shell" of routable
addresses wrapped around the entire current Internet (CRs and ERs),
separating it from the subscribers' IoTs that are either directly
addressable from the Internet such as T7z, T8z, or behind existing
private networks like RG7, RG8.
+------+
Web Server | WS0z |
+--+---+
|69.41.190.145
|
| +-----+
+--+ ER0 |
+--+--+
|
+------+-------+
ER1 ------+ +----- ER4
Interconnect | |
with ER2 ------+ Internet +----- ER5
Preceding | |
Figures ER3 ------+(Core Routers)+----- ER6
| |
+-------+ +--------+
| | | |
+--+--+ +--------------+ +--+--+
+-----+ ER7 | +-----+ ER8 |
| +-----+ | +-----+
| |
|69.41.190.170 |69.41.190.180
+--+--+ +--+--+
+-----------+ +-------+ +---------+ +------+
| +-----+ SPR7+--+ |EzIP-7 | +-----+ SPR8+--+ |
| ... | +-----+ |... | | | +-----+ | |
| | +--------+ | |...| |...|
240.0.0.1 | | 255.255.255.255 | | +---------+ |
| | | | | |
+------+ | 240.0.0.1 | | 255.255.255.255
| Premises 7 | +----------+ |
| | | Premises 8 |
|247.0.0.3 |247.0.0.9 |248.0.0.10 |248.0.0.40
+--+--+ +--+--+ +--+--+ +--+--+
| RG7 | .... | T7z | | T8z | ....... | RG8 |
+-----+ +-----+ +-----+ +-----+
Figure 18 EzIP System Architecture-D (240/4 Portion)
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+--------------------------+-----------------+----------------+
| | Basic IPv4 | EzIP-capable |
+--------------------------+-----------------+----------------+
| | ER0, ER1, ER2, | ------------ |
| Internet Edge Router (ER)| ER3, ER4, ER5, | |
| | ER6, ER7, ER8 | |
+--------------------------+-----------------+----------------+
| | T1a, T2a, T3a, | T1z, T2z, T3z, |
| Internet of Things (IoT) | T4a, T5a, T6a, | T4z, T5z, T6z, |
| | | T7z, T8z |
+--------------------------+-----------------+----------------+
| | RG1, RG2, RG3 | |
| Routing Gateway (RG) | RG7, RG8 | ------------ |
+--------------------------+-----------------+----------------+
| | ------------- | SPR1, SPR2, |
| Semi-Public Router (SPR) | | SPR3, SPR4, |
| | | SPR5, SPR6, |
| | | SPR7, SPR8 |
+--------------------------+-----------------+----------------+
| Web Server (WS) | ------------- | WS0z |
+--------------------------+-----------------+----------------+
Figure 19 EzIP System Components
Note: WS0z could be either a collection of conventional web servers
connected to the Internet via a SPR, with message transfer capability
among themselves, or a new web sever with multiple modules that
recognize and re-direct packets depending on its header (conventional
IP or EzIP) type. The main path functions the same as existing web
servers. The secondary servers are on EzIP extension addresses that
may be directly accessed by packets with EzIP header, or receive
packets forwarded through the main module upon being qualified.
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Appendix B EzIP Operation
To demonstrate how EzIP could support and enhance the Internet
operations, the following are three connection examples that involve
SPRs as shown in Figure 9. These present a general perspective of how
IP header transitions through the routers may look like.
A. The first example is between EzIP-unaware IoTs, T1a and T4a. This
operation is very much like the conventional TCP/IP packet
transmission except with SPRs acting as an extra pair of routers
supported by CGNAT. In addition, SPR4 may be viewed as a full-fledged
RG minus DHCP and NAT support, because it assigns its IoTs with
static addresses from the entire range of reserved 192.168/16,
instead of the common much smaller pool of 192.168.nnn/24.
B. The second one is between EzIP-capable IoTs, T1z and T4z. Here,
the SPRs process the extended public IP addresses in router mode,
avoiding the delays due to the NAT type of operations.
C. The last one is between EzIP-unaware and EzIP-capable IoTs. By
initiating and responding with a conventional IP header, T1z and T4z
behave like an EzIP-unaware IoT. Thus, all packet exchanges use the
conventional IP headers, just like case A. above.
B.1. Connection between EzIP-unaware IoTs
B.1.1. T1a Initiates a Session Request towards T4a
In Figure 20, T1a initiates a session request to SPR4 that serves T4a
by sending an IP packet to RG1. There is no TCP port number in this
IP header yet.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (5)|Type of Service| Total Length (20) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (192.168.1.3) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 20 IP Header: From T1a to RG1
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B.1.2. RG1 Forwards the Packet to SPR1
In Figure 21, RG1, allowing be masqueraded by T1a, relays the
packet toward SPR1 by assigning the TCP Source port number, 3N, to
T1a. Note that the suffix "N" denotes the actual TCP port number
assigned by the RG1's NAT. This could assume multiple values, each
represents a separate communications session that T1a is engaged in.
A corresponding entry is created in the state table for handling the
responding packet from the Destination site Since T4a's TCP port
number is not known yet, it is filled with all 1's.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (6)|Type of Service| Total Length (24) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (192.168.1.0) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
6 | Source Port (3N) | Destination Port (All 1's) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 21 TCP/IP Header: From RG1 to SPR1
B.1.3. SPR1 Sends the Packet to SPR4 through the Internet
In Figure 22, SPR1 allowing masqueraded by RG1 (with the Source Host
Number changed to be its own and the TCP port number changed to 1C,
where "C" stands for CGNAT) sends the packet out through the Internet
towards SPR4. The packet traverses through the Internet (ER1, CR and
ER4) utilizing only the basic IP header portion of address
information (words 4 & 5).
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (6)|Type of Service| Total Length (24) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (69.41.190.110) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
6 | Source Port (1C) | Destination Port (All 1's) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 22 TCP/IP Header: From SPR1 to SPR4
B.1.4. SPR4 Sends the Packet to T4a
Since the packet has a conventional IP header without Destination TCP
port number, SPR4 would ordinarily drop it due to the CGNAT function.
However, for this example, let's assume that there exists a state-
table that was set up by a DMZ process for redirecting this packet to
T4a with a CGNAT TCP port number 410C (the composite of the third and
the fourth octets, "4.10" of T4a's Extension No.). In Figure 23, SPR4
sends the packet to T4a by constructing the destination address
accordingly.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (6)|Type of Service| Total Length (24) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (69.41.190.110) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (192.168.4.10) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
6 | Source Port (1C) | Destination Port (410C) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 23 TCP/IP Header: From SPR4 to T4a
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B.1.5. T4a Replies to SPR4
In Figure 24, when T4a replies to SPR4, it interchanges the Source
and Destination identifications to create an IP header for the reply
packet.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (6)|Type of Service| Total Length (24) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (192.168.4.10) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.110) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
6 | Source Port (410C) | Destination Port (1C) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 24 TCP/IP Header: From T4a to SPR4
B.1.6. SPR4 Sends the Packet to SPR1 through the Internet
In Figure 25, SPR4 sends the packet toward SPR1 with the following
header through the Internet (ER4, CR and ER1) who will simply relay
the packet according to the information in word 5 (Destination Host
Number):
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (6)|Type of Service| Total Length (24) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.110) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
6 | Source Port (410C) | Destination Port (1C) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 25 TCP/IP Header: From SPR4 to SPR1
B.1.7. SPR1 Sends the Packet to RG1
In Figure 26, RG1 address is reconstructed by using the information
in the CGNAT state-table stored in SPR1.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (6)|Type of Service| Total Length (24) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (192.168.1.0) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
6 | Source Port (410C) | Destination Port (3N) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 26 TCP/IP Header: From SPR1 to RG1
B.1.8. RG1 Forwards the Packet to T1a
In Figure 27, T1a address is reconstructed from that of RG1 and the
state-table in the NAT based on Destination Port (3N).
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (6)|Type of Service| Total Length (24) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (192.168.1.3) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
6 | Source Port (410C) | Destination Port (3N) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 27 TCP/IP Header: From RG1 to T1a
B.1.9. T1a Sends a Follow-up Packet to RG1
To carry on the communication, T1a in Figure 28 sends the follow-up
packet to RG1 with a full TCP/IP header.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (6)|Type of Service| Total Length (24) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (192.168.1.3) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
6 | Source Port (3N) | Destination Port (410C) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 28 TCP/IP Header: Follow-up Packets From T1a to RG1
B.2. Connection Between EzIP-capable IoTs
The following is an example of EzIP operation between T1z and T4z
shown in Figure 9. Each knows its own full "Public - EzIP : Private"
network addresses, "69.41.190.110-192.168.1.0:9" and "69.41.190.148-
192.168.4.40", respectively, as well as the other's. Note that T4z
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full address does not have the IoT No. portion. It is directly
addressable from the Internet.
B.2.1. T1z Initiates a Session Request towards T4z
T1z initiates a session request to T4z by sending an EzIP packet to
RG1. There is no TCP port number word, because T4z does not have such
and that for T1z has not been assigned by the RG1's NAT.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (7)|Type of Service| Total Length (28) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (192.168.1.9) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | No |
6 | (Source) | Option Length | Source | Operation |
| (0X9B) | (3) | No. (1) | (00000001) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | Extended |
7 | (Destination) | Option Length | Destination | Destination |
| (0X9A) | (4) | No. (4) | No. (40) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 29 EzIP Header: From T1z to RG1
Note that 0X9A and 0X9B are temporarily selected from the available
"IP Option Numbers" [10]. They were employed by prior efforts to
facilitate the presentation of, EnIP and ExIP, respectively. These
convey the concepts of transporting the value of the "Network No." as
well as the number of octets needed in the "Extension No.". That is,
both Option Numbers represent 192.168/16 as the EzIP Network No.
prefix, while individually conveys two or one octets used in the
Extension No., respectively.
B.2.2. RG1 Forwards the Packet to SPR1
In Figure 30, RG1, allowing to be masqueraded by T1z, relays the
packet toward SPR1 by assigning the TCP Source port number, 9N, to
T1z. Since T4z is directly connected to the Internet, there is no
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private network information to fill the Destination portion of the
TCP word.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (7)|Type of Service| Total Length (32) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (192.168.1.0) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | No |
6 | (Source) | Option Length | Source | Operation |
| (0X9B) | (3) | No. (1) | (00000001) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | Extended |
7 | (Destination) | Option Length | Destination | Destination |
| (0X9A) | (4) | No. (4) | No. (40) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
8 | Source Port (9N) | Destination Port (All 1's) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 30 TCP/EzIP Header: From RG1 to SPR1
B.2.3. SPR1 Sends the Packet to SPR4 through the Internet
In Figure 31, SPR1 sends the packet out into the Internet towards
SPR4. The packet traverses through the Internet (ER1, CR and ER4),
utilizing only the basic IP header portion of address information.
Note that the third octet of word 6 plus the first two octets of word
8 make up the subnet address of T1z. And, the last two octets of word
7 represent the extended address of T4z.
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (7)|Type of Service| Total Length (32) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (69.41.190.110) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | No |
6 | (Source) | Option Length | Source | Operation |
| (0X9B) | (3) | No. (1) | (00000001) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | Extended |
7 | (Destination) | Option Length | Destination | Destination |
| (0X9A) | (4) | No. (4) | No. (40) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
8 | Source Port (9N) | Destination Port (All 1's) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 31 TCP/EzIP Header: From SPR1 to SPR4
B.2.4. SPR4 Sends the Packet towards T4z to RG2
In Figure 32, SPR4 sends the packet to RG2 by reconstructing its
address from the Option number and the Extended Destination No.
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (7)|Type of Service| Total Length (32) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (69.41.190.110) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (192.168.4.40) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | No |
6 | (Source) | Option Length | Source | Operation |
| (0X9B) | (3) | No. (1) | (00000001) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | Extended |
7 | (Destination) | Option Length | Destination | Destination |
| (0X9A) | (4) | No. (4) | No. (40) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
8 | Source Port (9N) | Destination Port (All 1's) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 32 TCP/EzIP Header: From SPR4 to T4z
B.2.5. T4z Replies to SPR4
In Figure 33, T4z replies to SPR4 with the full T1z identification
(69.41.190.110-192.68.1.0:192.168.1.9N conveyed by Option ID 0X9B
together with the compact address string 69.41.190.110-1:9N) to
create an EzIP header for the reply packet.
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (7)|Type of Service| Total Length (32) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (192.168.4.40) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.110) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | Extended |
6 | (Source) | Option Length | Source | Source |
| (0X9A) | (4) | No. (4) | No. (40) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | End of |
7 | (Destination) | Option Length | Destination | Option |
| (0X9B) | (3) | No. (1) | (00000000) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
8 | Source Port (All 1's) | Destination Port (9N) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 33 TCP/EzIP Header: From T4z to SPR4
B.2.6. SPR4 Sends the Packet to SPR1 through the Internet
In Figure 34, SPR4 sends the packet toward SPR1 with the following
header through the Internet (ER2, CR, and ER1) who will simply relay
the packet according to the information in word 5 (Destination Host
Number):
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (7)|Type of Service| Total Length (32) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.110) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | Extended |
6 | (Source) | Option Length | Source | Source |
| (0X9A) | (4) | No. (4) | No. (40) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | End of |
7 | (Destination) | Option Length | Destination | Option |
| (0X9B) | (3) | No. (1) | (00000000) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
8 | Source Port (All 1's) | Destination Port (9N) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 34 TCP/EzIP Header: From SPR4 to SPR1
B.2.7. SPR1 Sends the Packet to RG1
In Figure 35, RG1 address is reconstructed from the Option number and
the Extended Destination No.
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (7)|Type of Service| Total Length (32) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (192.168.1.0) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | Extended |
6 | (Source) | Option Length | Source | Source |
| (0X9A) | (4) | No. (4) | No. (40) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | End of |
7 | (Destination) | Option Length | Destination | Option |
| (0X9B) | (3) | No. (1) | (00000000) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
8 | Source Port (All 1's) | Destination Port (9N) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 35 TCP/EzIP Header: From SPR1 to RG1
B.2.8. RG1 Forwards the Packet to T1z
In Figure 36, T1z address is reconstructed from that of RG1 and the
NAT state-table based on Destination Port (9N).
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (7)|Type of Service| Total Length (32) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (192.168.1.9) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | Extended |
6 | (Source) | Option Length | Source | Source |
| (0X9A) | (4) | No. (4) | No. (40) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | End of |
7 | (Destination) | Option Length | Destination | Option |
| (0X9B) | (3) | No. (1) | (00000000) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
8 | Source Port (All 1's) | Destination Port (9N) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 36 TCP/EzIP Header: From RG1 to T1z
B.2.9. T1z Sends a Follow-up Packet to RG1
In Figure 37, T1z sends a follow-up packet to RG1 with all fields
filled with needed information.
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1 |Version|IHL (7)|Type of Service| Total Length (32) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2 | Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3 | Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 | Source Host Number (192.168.1.9) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5 | Destination Host Number (69.41.190.148) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | No Op |
6 | (Source) | Option Length | Source | Option |
| (0X9B) | (3) | No. (1) | (00000001) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EzIP ID | EzIP | Extended | Extended |
7 | (Destination) | Option Length | Destination | Destination |
| (0X9A) | (4) | No. (4) | No. (40) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
8 | Source Port (9N) | Destination Port (All 1's) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 37 TCP/EzIP Header: Follow-up Packets from T1z to RG1
B.3. Connection Between EzIP-unaware and EzIP-capable IoTs
B.3.1. T1a initiates a request to T4z
Since T1a can create only IP header with conventional format, the
SPRs will provide CGNAT type of services to the IP packets. And,
assuming SPR4 has a state-table set up by DMZ for forwarding the
request to T4z, the packet will be delivered to T4z. Seeing the
incoming packet using conventional IP header, T4z should respond with
the same so that the session will be conducted with conventional
TCP/IP headers.
B.3.2. T1z initiates a request to T4a
Knowing T4a is not capable of EzIP header, T1z purposely initiates
the request packet using conventional IP header. It will be treated
by SPRs in the same manner as the T1a initiated case above and
recognizable by T4a.
In brief, the steps outlined above are very much the same as the
conventional TCP/IP header transitions between routers, except two
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extra steps in each direction are inserted to encode and decode the
additional SPR provided EzIP routing process.
Note that when an IoT, such as T4a or T4z, is directly connected to a
SPR, like SPR4, there is no RG in-between. There is no corresponding
TCP port number in word 8 of the above TCP/EzIP headers. This spare
facility in the header allows an RG be inserted if desired, thus re-
establishing the private network environment.
When only its Extension No. portion of an EzIP extension address is
transported in the EzIP header, the conventional private network
address may be reused in this kind of added private networks. When
extension address is transported by a full TCP/EzIP header with four
octet format, proper precaution must be exercised to avoid confusing
the routers along the way due to the appearance of a full private
network address although at a location in the IP header not intended
for ordinary IP address. When EzIP-7 is used, this is not of concern
because the 240/4 block does not belong to the three conventional
private network address blocks.
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Appendix C Internet Transition Considerations
To enhance a large communication system like the Internet, it is
important to minimize the disturbance to the existing equipments and
processes due to any needed modification. The basic EzIP plan is to
confine all actionable enhancements within the new SPR module. The
following outlines the considerations for supporting the transition
from the current Internet to the one enhanced by the EzIP technique.
C.1. EzIP Implementation
C.1.1. Introductory Phase:
A. Insert an SPR in front of a web-server that desires to have
additional subnet addresses for offering diversified activities. For
the long term, a new web server may be designed with these two
functional modules combined.
. The first address of a private network address pool, e.g.,
192.168.0.0, used by the SPR should be reserved as a DMZ (De-
Militarized Zone) channel directing the initial incoming service
requesting packets to the existing web server. This will maintain the
same operation behavior projected to the general public.
. The additional addresses, up to 192.168.255.255 may be used for
EzIP address extension purposes. Each may be assigned to an
additional web server representing one of the business's new
activities. Each of these new servers will then respond with EzIP
header to messages forwarded from the main server, or be directly
accessed through its EzIP address.
B. Insert an SPR in front of a group of subscribers who are to be
served with the EzIP function. The basic service provided by this SPR
will be the CGNAT equivalent function. This will maintain the same
baseline user experience in accessing the Internet.
C. Session initiating packets with basic IPv4 header will be routed
by SPRs to a business's existing server at the currently published
IPv4 public address (discoverable by existing DNS). The server should
respond with the basic IPv4 format as well. Essentially, this
maintains the existing interaction between a user and a web server
within an EzIP-unaware environment.
So far, neither the web-server nor any subscriber's IoTs needs to
be enhanced, because the operations remain pretty much the same as
today's common practice utilizing CGNAT assisted connectivity. See
Appendix B.1. for an example.
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D. Upon connected to the main web server, if a customer intentionally
selects one of the new services offered by the primary web-server,
the web-server will ask the customer to confirm the selection.
. If confirmed, implying that the customer is aware of the fact
that his IoT is being served by an SPR, the web server forwards the
request to a branch server for carrying on the communication via an
EzIP address.
. The SPR at the originating side, recognizing the EzIP header
from the web-server, replaces the CGNAT service with EzIP routing.
. For all subsequent packets exchanged, the EzIP headers will be
used in either direction. See Appendix B.2. for an example. This will
speed up the transmission throughput performance for the rest of the
session.
C.1.2. New IoT Operation Modes:
A. EzIP-capable IoT will create EzIP header in initiating a session,
to directly reach a specific web-server, instead of the lengthy steps
of going through the DMZ port followed by manually making the
selection from the main web server. This will speed up the initial
handshake process. See Appendix B.2. for an example.
B. To communicate with an EzIP-unaware IoT, an EzIP-capable IoT
should purposely initiate a session with conventional IP header. This
will signal the SPRs to provide just CGNAT type of connection
service. See Appendix B.3. for an example.
C.1.3. End-to-End Operation:
Once EzIP-capable IoTs become common for the general public, direct
communication between any pair of such IoTs will be achievable. An
EzIP-capable IoT, knowing the other IoT's full EzIP address, may
initiate a session by creating an EzIP header that directs the SPRs
to provide EzIP services, bypassing the CGNAT process. See Appendix
B.2. for an example.
C.2. SPR Operation Logic
To support the above scenarios, the SPR should be designed with the
following decision process:
C.2.1. Initiating a Session Request for an IoT or via a RG
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If a session request IP packet contains EzIP Option word, it will be
routed forward by SPR accordingly. Otherwise, the SPR provides CGNAT
service by assigning a TCP port number to the packet and allowing the
packet to masquerade with the SPR's own IP address while an entry to
the state (port forward / look-up / hash) table is created in
anticipation of the reply packet.
C.2.2. Receiving a Session Request from the ER
If a received IP packet includes a valid EzIP Option word or port
number, SPR will utilize it to route the packet to an RG or an IoT.
For a packet with plain IP header, it will be routed according to the
Destination Host Number (IP header word 5).
C.3. RG Enhancement
With IPv4 address pool expanded by the EzIP schemes, there will be
sufficient publicly assignable addresses for IoTs wishing to be
directly accessible. The existing private networks may continue their
current behavior of blocking session request packets from the
Internet. In-between, another connection mode is possible. The
following describes such an option in the context of the existing RG
operation conventions.
C.3.1. Initiating Session request for an IoT
Without regard to whether the IP header is a conventional one or an
EzIP type, a RG allows a packet to masquerade with the RG's own IP
address by assigning a TCP port number to the packet and creating an
entry to the state (port forward / look-up / hash) table. This is the
same as current NAT practice.
C.3.2. Receiving a packet from the SPR
The "Destination Port" value in the packet is examined:
A. If it matches with an entry in the RG NAT's state-table, the
packet is forward to the corresponding address. This is the same as
the normal NAT processes in a conventional RG.
B. If it matches with the address of an active IoT on the private
network, the packet is assigned with a TCP port number and then
forwarded to that IoT.
Note that there is certain amount of increased security risk with
this added last step, because a match between a guessed destination
identity and the above two lists could happen by chance. To address
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this issue, the following proactive mechanism may be incorporated in
parallel:
If the "Destination Port" number is null or does not match with
either of the above cases, the packet is dropped and an alarm state
is activated to monitor for possible ill-intended follow-up attempts.
A defensive mechanism should be triggered when the number of failed
attempts has exceeded the preset threshold within a finite time
interval.
In brief, if the IP header of a session requesting packet indicates
that the sender knows the identity of the desired destination IoT on
a private network, the common RG screening process will be bypassed.
This facilitates the direct end-to-end connection, even in the
presence of the NAT. Note that this process is very much the same as
the AA (Automated Attendant) capability in a PABX telephone switching
system that automatically makes the connection for a caller who
indicates (via proper secondary dialing or the equivalent) knowing
the extension number of the destination party. Such process can
effectively screen out most of the unwanted callers.
Authors' Addresses
Abraham Y. Chen
Avinta Communications, Inc.
142 N. Milpitas Blvd., #148, Milpitas, CA 95035-4401 US
Phone: _+1(408)942-1485
Email: AYChen@Avinta.com
Ramamurthy R. Ati
Avinta Communications, Inc.
142 N. Milpitas Blvd., #148, Milpitas, CA 95035-4401 US
Phone: _+1(408)458-7109
Email: ramaati18@gmail.com
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