| Network Working Group | S. Sivakumar |
| Internet-Draft | Cisco Systems |
| Intended status: Standards Track | M. Boucadair |
| Expires: March 6, 2016 | France Telecom |
| S. Vinapamula | |
| Juniper Networks | |
| September 3, 2015 |
YANG Data Model for Network Address Translation (NAT)
draft-sivakumar-yang-nat-00
For the sake of network automation and the need for programming NAT function in particular, a data model for configuring and managing the NAT device is essential. This document defines a YANG data model for the NAT function. Both the NAT44 and NAT64 are covered in this document.
This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress."
This Internet-Draft will expire on March 6, 2016.
Copyright (c) 2015 IETF Trust and the persons identified as the document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License.
This document defines a data model for Network Address Translation (NAT) using the YANG data modeling language [RFC6020]. Traditional NAT is defined in [RFC2663] and Carrier Grade NAT is defined in [RFC6888]. This document covers the NAT features in both documents. This document also covers the NAT64 as defined in [RFC6146].
This document assumes [RFC4787][RFC5382][RFC5508] are enabled by default.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].
The usage of the term "NAT device" in this document refer to any NAT44 and NAT64 devices. This document uses the term "Session" as it is defined in [RFC2663] and the term BIB as it is defined in [RFC6146].
The meaning of the symbols in these diagrams is as follows:
The NAT data model is designed to cover both configuration and state retrieval, nevertheless this document covers dynamic (implicit) mapping while PCP-related functionality to instruct dynamic explicit mapping is defined in [I-D.boucadair-pcp-yang].
In order to cover both NAT64 and NAT44 flavors, the NAT mapping structure allows to include an IPv4 or IPv6 address as an internal IP address. Remaining fields are common to both NAT schemes.
A NAT function can either assign individual port numbers or port sets. Both features are supported in the YANG data model.
To accommodate deployments where [RFC6302] is not enabled, the NAT function can be configured to log the destination port number.
This data model assumes that pools of IPv4 addresses can be provisioned to NAT function. These pools may be contiguous or non-contiguous.
A NAT device can enabled multiple NAT instances; each responsible to service a group of internal hosts. This document does make any assumption how internal hosts are attached to a given NAT instance.
The data model assumes that each NAT instance can: be enable/disabled, be provisioned with a dedicated configuration data, and maintain its own mapping table.
This version of the document does not cover the following functionalities:
The tree structure of the NAT data model is provided below:
module: ietf-nat
+--rw nat-config
| +--rw nat-instances
| +--rw nat-instance* [id]
| +--rw id uint32
| +--rw enable? boolean
| +--rw external-ip-address-pool* [pool-id]
| | +--rw pool-id uint32
| | +--rw external-ip-pool? inet:ipv4-prefix
| +--rw subscriber-mask-v6? uint8
| +--rw subscriber-mask-v4* [sub-mask-id]
| | +--rw sub-mask-id uint32
| | +--rw sub-mask inet:ipv4-prefix
| +--rw paired-address-pooling? boolean
| +--rw endpoint-independent-mapping? boolean
| +--rw address-dependent-mapping? boolean
| +--rw address-and-port-dependent-mapping? boolean
| +--rw endpoint-independent-filtering? boolean
| +--rw address-dependent-filtering? boolean
| +--rw address-and-port-dependent-filtering? boolean
| +--rw port-quota? uint16
| +--rw port-quota? uint16
| +--rw port-set
| | +--rw port-set-enable? boolean
| | +--rw port-set-size? uint16
| | +--rw port-set-timeout? uint32
| +--rw port-randomization-enable? boolean
| +--rw port-preservation-enable? boolean
| +--rw port-range-preservation-enable? boolean
| +--rw port-parity-preservation-enable? boolean
| +--rw address-roundrobin-enable? boolean
| +--rw udp-timeouts? uint32
| +--rw tcp-idle-timeout? uint32
| +--rw tcp-trans-open-timeout? uint32
| +--rw tcp-trans-close-timeout? uint32
| +--rw tcp-in-syn-timeout? uint32
| +--rw fragment-min-timeout? uint32
| +--rw icmp-timeout? uint32
| +--rw logging-info
| | +--rw destination-address inet:ipv4-prefix
| | +--rw destination-port uint32
| +--rw connection-limit
| | +--rw limit-per-subscriber? uint32
| | +--rw limit-per-vrf? uint32
| | +--rw limit-per-subnet? inet:ipv4-prefix
| | +--rw limit-per-instance uint32
| +--rw mapping-limit
| | +--rw limit-per-subscriber? uint32
| | +--rw limit-per-vrf? uint32
| | +--rw limit-per-subnet? inet:ipv4-prefix
| | +--rw limit-per-instance uint32
| +--rw ftp-alg-enable? boolean
| +--rw dns-alg-enable? boolean
| +--rw tftp-alg-enable? boolean
| +--rw msrpc-alg-enable? boolean
| +--rw netbios-alg-enable? boolean
| +--rw rcmd-alg-enable? boolean
| +--rw ldap-alg-enable? boolean
| +--rw sip-alg-enable? boolean
| +--rw rtsp-alg-enable? boolean
| +--rw h323-alg-enable? boolean
| +--rw all-algs-enable? boolean
| +--rw notify-pool-usage
| | +--rw pool-id? uint32
| | +--rw notify-pool-hi-threshold percent
| | +--rw notify-pool-low-threshold? percent
| +--rw stealth-mode? boolean
| +--rw mapping-table
| +--rw mapping-entry* [index]
| +--rw index uint32
| +--rw type? enumeration
| +--rw internal-src-address inet:ip-address
| +--rw internal-src-port
| | +--rw (port-type)?
| | +--:(single-port-number)
| | | +--rw single-port-number? inet:port-number
| | +--:(port-range)
| | +--rw start-port-number? inet:port-number
| | +--rw end-port-number? inet:port-number
| +--rw external-src-address inet:ipv4-address
| +--rw external-src-port
| | +--rw (port-type)?
| | +--:(single-port-number)
| | | +--rw single-port-number? inet:port-number
| | +--:(port-range)
| | +--rw start-port-number? inet:port-number
| | +--rw end-port-number? inet:port-number
| +--rw transport-protocol uint8
| +--rw internal-dst-address? inet:ipv4-prefix
| +--rw internal-dst-port
| | +--rw (port-type)?
| | +--:(single-port-number)
| | | +--rw single-port-number? inet:port-number
| | +--:(port-range)
| | +--rw start-port-number? inet:port-number
| | +--rw end-port-number? inet:port-number
| +--rw external-dst-address inet:ipv4-address
| +--rw external-dst-port
| | +--rw (port-type)?
| | +--:(single-port-number)
| | | +--rw single-port-number? inet:port-number
| | +--:(port-range)
| | +--rw start-port-number? inet:port-number
| | +--rw end-port-number? inet:port-number
| +--rw lifetime uint32
+--ro nat-state
+--ro nat-instances
+--ro nat-instance* [id]
+--ro id int32
+--ro nat-capabilities
| +--ro nat44-support? boolean
| +--ro nat64-support? boolean
| +--ro port-set-support? boolean
| +--ro port-randomization-support? boolean
| +--ro port-preservation-suport? boolean
| +--ro port-range-preservation-support? boolean
| +--ro port-parity-preservation-support? boolean
| +--ro address-roundrobin-support? boolean
| +--ro ftp-alg-support? boolean
| +--ro dns-alg-support? boolean
| +--ro tftp-support? boolean
| +--ro msrpc-alg-support? boolean
| +--ro netbios-alg-support? boolean
| +--ro rcmd-alg-support? boolean
| +--ro ldap-alg-support? boolean
| +--ro sip-alg-support? boolean
| +--ro rtsp-alg-support? boolean
| +--ro h323-alg-support? boolean
| +--ro paired-address-pooling-support? boolean
| +--ro endpoint-independent-mapping-support? boolean
| +--ro address-dependent-mapping-support? boolean
| +--ro address-and-port-dependent-mapping-support? boolean
| +--ro endpoint-independent-filtering-support? boolean
| +--ro address-dependent-filtering? boolean
| +--ro address-and-port-dependent-filtering? boolean
| +--ro stealth-mode-support? boolean
+--ro nat-current-config
| +--ro external-ip-address-pool* [pool-id]
| | +--ro pool-id uint32
| | +--ro external-ip-pool? inet:ipv4-prefix
| +--ro subscriber-mask-v6? uint8
| +--ro subscriber-mask-v4* [sub-mask-id]
| | +--ro sub-mask-id uint32
| | +--ro sub-mask inet:ipv4-prefix
| +--ro paired-address-pooling? boolean
| +--ro port-quota? uint16
| +--ro endpoint-independent-mapping? boolean
| +--ro address-dependent-mapping? boolean
| +--ro address-and-port-dependent-mapping? boolean
| +--ro endpoint-independent-filtering? boolean
| +--ro address-dependent-filtering? boolean
| +--ro address-and-port-dependent-filtering? boolean
| +--ro port-set
| | +--ro port-set-enable? boolean
| | +--ro port-set-size? uint16
| | +--ro port-set-timeout? uint32
| +--ro port-randomization-enable? boolean
| +--ro port-preservation-enable? boolean
| +--ro port-range-preservation-enable? boolean
| +--ro port-parity-preservation-enable? boolean
| +--ro address-roundrobin-enable? boolean
| +--ro udp-timeouts? uint32
| +--ro tcp-idle-timeout? uint32
| +--ro tcp-trans-open-timeout? uint32
| +--ro tcp-trans-close-timeout? uint32
| +--ro tcp-in-syn-timeout? uint32
| +--ro fragment-min-timeout? uint32
| +--ro icmp-timeout? uint32
| +--ro logging-info
| | +--ro destination-address inet:ipv4-prefix
| | +--ro destination-port uint32
| +--ro connection-limit
| | +--ro limit-per-subscriber? uint32
| | +--ro limit-per-vrf? uint32
| | +--ro limit-per-subnet? inet:ipv4-prefix
| | +--ro limit-per-instance uint32
| +--ro mapping-limit
| | +--ro limit-per-subscriber? uint32
| | +--ro limit-per-vrf? uint32
| | +--ro limit-per-subnet? inet:ipv4-prefix
| | +--ro limit-per-instance uint32
| +--ro ftp-alg-enable? boolean
| +--ro dns-alg-enable? boolean
| +--ro tftp-alg-enable? boolean
| +--ro msrpc-alg-enable? boolean
| +--ro netbios-alg-enable? boolean
| +--ro rcmd-alg-enable? boolean
| +--ro ldap-alg-enable? boolean
| +--ro sip-alg-enable? boolean
| +--ro rtsp-alg-enable? boolean
| +--ro h323-alg-enable? boolean
| +--ro all-algs-enable? boolean
| +--ro notify-pool-usage
| +--ro pool-id? uint32
| +--ro notify-pool-hi-threshold percent
| +--ro notify-pool-low-threshold? percent
| +--ro stealth-mode? boolean
+--ro mapping-table
| +--ro mapping-entry* [index]
| +--ro index uint32
| +--ro type? enumeration
| +--ro internal-src-address inet:ip-address
| +--ro internal-src-port
| | +--ro (port-type)?
| | +--:(single-port-number)
| | | +--ro single-port-number? inet:port-number
| | +--:(port-range)
| | +--ro start-port-number? inet:port-number
| | +--ro end-port-number? inet:port-number
| +--ro external-src-address inet:ipv4-address
| +--ro external-src-port
| | +--ro (port-type)?
| | +--:(single-port-number)
| | | +--ro single-port-number? inet:port-number
| | +--:(port-range)
| | +--ro start-port-number? inet:port-number
| | +--ro end-port-number? inet:port-number
| +--ro transport-protocol uint8
| +--ro internal-dst-address? inet:ipv4-prefix
| +--ro internal-dst-port
| | +--ro (port-type)?
| | +--:(single-port-number)
| | | +--ro single-port-number? inet:port-number
| | +--:(port-range)
| | +--ro start-port-number? inet:port-number
| | +--ro end-port-number? inet:port-number
| +--ro external-dst-address inet:ipv4-address
| +--ro external-dst-port
| | +--ro (port-type)?
| | +--:(single-port-number)
| | | +--ro single-port-number? inet:port-number
| | +--:(port-range)
| | +--ro start-port-number? inet:port-number
| | +--ro end-port-number? inet:port-number
| +--ro lifetime uint32
+--ro statistics
+--ro total-mappings? uint32
+--ro total-tcp-mappings? uint32
+--ro total-udp-mappings? uint32
+--ro total-icmp-mappings? uint32
+--ro pool-stats
+--ro pool-id? uint32
+--ro address-allocated? uint32
+--ro address-free? uint32
+--ro port-stats
+--ro ports-allocated? uint32
+--ro ports-free? uint32
<CODE BEGINS> file "ietf-nat@2015-08-29.yang"
module ietf-nat {
namespace "urn:ietf:params:xml:ns:yang:ietf-nat";
//namespace to be assigned by IANA
prefix "nat";
import ietf-inet-types {
prefix "inet";
}
organization "IETF NetMod Working Group";
contact
"Senthil Sivakumar <ssenthil@cisco.com>
Mohamed Boucadair <mohamed.boucadair@orange.com>
Suresh Vinapamula <sureshk@juniper.net>";
description
"This module is a YANG module for NAT implementations
(including both NAT44 and NAT64 flavors.
Copyright (c) 2015 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject
to the license terms contained in, the Simplified BSD License
set forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(http://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX; see
the RFC itself for full legal notices.";
revision 2015-08-29 {
description "Changes xxxx.";
reference "xxxx";
}
typedef percent {
type uint8 {
range "0 .. 100";
}
description
"Percentage";
}
/*
* Grouping
*/
grouping timeouts {
description
"Configure values of various timeouts.";
leaf udp-timeouts {
type uint32;
default 300;
description
"UDP inactivity timeout.";
}
leaf tcp-idle-timeout {
type uint32;
default 7440;
description
"TCP Idle timeout, as per RFC 5382 should be no
2 hours and 4 minutes.";
}
leaf tcp-trans-open-timeout {
type uint32;
default 240;
description
"The value of the transitory open connection
idle-timeout.";
}
leaf tcp-trans-close-timeout {
type uint32;
default 240;
description
"The value of the transitory close connection
idle-timeout.";
}
leaf tcp-in-syn-timeout {
type uint32;
default 6;
description
"6 seconds, as defined in [RFC5382].";
}
leaf fragment-min-timeout {
type uint32;
default 2;
description
"As long as the NAT has available resources,
the NAT allows the fragments to arrive
over fragment-min-timeout interval.
The default value is inspired from RFC6146.";
}
leaf icmp-timeout {
type uint32;
default 60;
description
"60 seconds, as defined in [RFC5508].";
}
}
// port numbers: single or port range
grouping port-number {
description
"Individual port or a range of ports.";
choice port-type {
default single-port-number;
description
"Port type: single or port-range.";
case single-port-number {
leaf single-port-number {
type inet:port-number;
description
"Used for single port numbers.";
}
}
case port-range {
leaf start-port-number {
type inet:port-number;
description
"Begining of the port range.";
}
leaf end-port-number {
type inet:port-number;
description
"End of the port range.";
}
}
}
}
grouping mapping-entry {
description
"NAT mapping entry.";
leaf index {
type uint32;
description
"A unique identifier of a mapping entry.";
}
leaf type {
type enumeration {
enum "static" {
description
"The mapping entry is manually configured.";
}
enum "dynamic" {
description
"This mapping is created by an outgoing
packet.";
}
}
description
"Indicates the type of a mapping entry. E.g.,
a mapping can be: static or dynamic";
}
leaf internal-src-address {
type inet:ip-address;
mandatory true;
description
"Corresponds to the source IPv4/IPv6 address
of the IPv4 packet";
}
container internal-src-port {
description
"Corresponds to the source port of the
IPv4 packet.";
uses port-number;
}
leaf external-src-address {
type inet:ipv4-address;
mandatory true;
description
"External IPv4 address assigned by NAT";
}
container external-src-port {
description
"External source port number assigned by NAT.";
uses port-number;
}
leaf transport-protocol {
type uint8;
mandatory true;
description
"Upper-layer protocol associated with this mapping.
Values are taken from the IANA protocol registry.
For example, this field contains 6 (TCP) for a TCP
mapping or 17 (UDP) for a UDP mapping.";
}
leaf internal-dst-address {
type inet:ipv4-prefix;
description
"Corresponds to the destination IPv4 address
of the IPv4 packet, for example, some NAT
implementation support translating both source
and destination address and ports referred to as
Twice NAT";
}
container internal-dst-port {
description
"Corresponds to the destination port of the
IPv4 packet.";
uses port-number;
}
leaf external-dst-address {
type inet:ipv4-address;
mandatory true;
description
"External destination IPv4 address";
}
container external-dst-port {
description
"External source port number.";
uses port-number;
}
leaf lifetime {
type uint32;
mandatory true;
description
"Lifetime of the mapping.";
}
}
grouping nat-parameters {
description
"NAT parameters for a given instance";
list external-ip-address-pool {
key pool-id;
description
"Pool of external IP addresses used to service
internal hosts.
Both contiguous and non-contiguous pools
can be configured for NAT.";
leaf pool-id {
type uint32;
description
"An identifier of the address pool.";
}
leaf external-ip-pool {
type inet:ipv4-prefix;
description
"An IPv4 prefix used for NAT purposes.";
}
}
leaf subscriber-mask-v6 {
type uint8 {
range "0 .. 128";
}
description
"The subscriber-mask is an integer that indicates
the length of significant bits to be applied on
the source IP address (internal side) to
unambiguously identify a CPE.
Subscriber-mask is a system-wide configuration
parameter that is used to enforce generic
per-subscriberpolicies (e.g., port-quota).
The enforcement of these generic policies does not
require the configuration of every subscriber's
prefix.
Example: suppose the 2001:db8:100:100::/56 prefix is
assigned to a NAT64 serviced CPE. Suppose also that
2001:db8:100:100::1 is the IPv6 address used by the
client that resides in that CPE. When the NAT64
receives a packet from this client,
it applies the subscriber-mask (e.g., 56) on
the source IPv6 address to compute the associated
prefix for this client (2001:db8:100:100::/56).
Then, the NAT64 enforces policies based on that
prefix (2001:db8:100:100::/56), not on the exact
source IPv6 address.";
}
list subscriber-mask-v4 {
leaf sub-mask-id {
type uint32;
description
"An identifier of the subscriber masks.";
}
leaf sub-mask {
type inet:ipv4-prefix;
mandatory true;
description
"The IP address subnets that matches should be
translated. For eg. If the private realms that
are to be translated by NAT would be 192.168.0.0/24";
}
}
leaf paired-address-pooling {
type boolean;
default true;
description
"Paired address pooling is indicating to NAT
that all the flows from an internal IP
address must be assigned the same external
address. This is defined in RFC 4007.";
}
leaf endpoint-independent-mapping {
type boolean;
description
"Refer section 4 of RFC 4787.";
}
leaf address-dependent-mapping {
type boolean;
description
"Refer section 4 of RFC 4787.";
}
leaf address-and-port-dependent-mapping {
type boolean;
description
"Refer section 4 of RFC 4787.";
}
leaf endpoint-independent-filtering {
type boolean;
description
"Refer section 5 of RFC 4787.";
}
leaf address-dependent-filtering {
type boolean;
description
"Refer section 5 of RFC 4787.";
}
leaf address-and-port-dependent-filtering {
type boolean;
description
"Refer section 5 of RFC 4787.";
}
leaf port-quota {
type uint16;
description
"Configures a port quota to be assigned per
subscriber.";
}
container port-set {
description
"Manages port-set assignments.";
leaf port-set-enable {
type boolean;
description
"Enable/Disable port set assignment.";
}
leaf port-set-size {
type uint16;
description
"Indicates the size of assigned port
sets.";
}
leaf port-set-timeout {
type uint32;
description
"Inactivty timeout for port sets.";
}
}
leaf port-randomization-enable {
type boolean;
description
"Enable/disable port randomization
feature.";
}
leaf port-preservation-enable {
type boolean;
description
"Indicates whether the PCP server should
preserve the internal port number.";
}
leaf port-range-preservation-enable {
type boolean;
description
"Indicates whether the NAT device should
preserve the internal port range.";
}
leaf port-parity-preservation-enable {
type boolean;
description
"Indicates whether the PCP server should
preserve the port parity of the
internal port number.";
}
leaf address-roundrobin-enable {
type boolean;
description
"Enable/disable address allocation roundrobin.";
}
uses timeouts;
container logging-info {
description
"Information about Logging NAT events";
leaf destination-address {
type inet:ipv4-prefix;
mandatory true;
description
"Address of the collector that receives
the logs";
}
container destination-port {
description
"Destination port of the collector.";
uses port-number;
}
}
container connection-limit {
description
"Information on the config parameters that
rate limit the translations based on various
criteria";
leaf limit-per-subscriber {
type uint32;
description
"Maximum number of NAT mappings per
subscriber.";
}
leaf limit-per-vrf {
type uint32;
description
"Maximum number of NAT mappings per
VLAN/VRF.";
}
leaf limit-per-subnet {
type inet:ipv4-prefix;
description
"Maximum number of NAT mappings per
subnet.";
}
leaf limit-per-instance {
type uint32;
mandatory true;
description
"Maximum number of NAT mappings per
instance.";
}
}
container mapping-limit {
description
"Information on the config parameters that
rate limit the mappings based on various
criteria";
leaf limit-per-subscriber {
type uint32;
description
"Maximum number of NAT mappings per
subscriber.";
}
leaf limit-per-vrf {
type uint32;
description
"Maximum number of NAT mappings per
VLAN/VRF.";
}
leaf limit-per-subnet {
type inet:ipv4-prefix;
description
"Maximum number of NAT mappings per
subnet.";
}
leaf limit-per-instance {
type uint32;
mandatory true;
description
"Maximum number of NAT mappings per
instance.";
}
}
leaf ftp-alg-enable {
type boolean;
description
"Enable/Disable FTP ALG";
}
leaf dns-alg-enable {
type boolean;
description
"Enable/Disable DNSALG";
}
leaf tftp-alg-enable {
type boolean;
description
"Enable/Disable TFTP ALG";
}
leaf msrpc-alg-enable {
type boolean;
description
"Enable/Disable MS-RPC ALG";
}
leaf netbios-alg-enable {
type boolean;
description
"Enable/Disable NetBIOS ALG";
}
leaf rcmd-alg-enable {
type boolean;
description
"Enable/Disable rcmd ALG";
}
leaf ldap-alg-enable {
type boolean;
description
"Enable/Disable LDAP ALG";
}
leaf sip-alg-enable {
type boolean;
description
"Enable/Disable SIP ALG";
}
leaf rtsp-alg-enable {
type boolean;
description
"Enable/Disable RTSP ALG";
}
leaf h323-alg-enable {
type boolean;
description
"Enable/Disable H323 ALG";
}
leaf all-algs-enable {
type boolean;
description
"Enable/Disable all the ALGs";
}
container notify-pool-usage {
description
"Notification of Pool usage when certain criteria
is met";
leaf pool-id {
type uint32;
description
"Pool-ID for which the notification
criteria is defined";
}
leaf notify-pool-hi-threshold {
type percent;
mandatory true;
description
"Notification must be generated when the
defined high threshold is reached.
For example, if a notification is
required when the pool utilization reaches
90%, this configuration parameter must
be set to 90%";
}
leaf notify-pool-low-threshold {
type percent;
description
"Notification must be generated when the defined
low threshold is reached.
For example, if a notification is required when
the pool utilization reaches below 10%,
this configuration parameter must be set to
10%";
}
}
} //nat-parameters group
container nat-config {
description
"NAT";
container nat-instances {
description
"nat instances";
list nat-instance {
key "id";
description
"A NAT instance.";
leaf id {
type uint32;
description
"NAT instance identifier.";
}
leaf enable {
type boolean;
description
"Status of the the NAT instance.";
}
uses nat-parameters;
container mapping-table {
description
"NAT dynamic mapping table used to track
sessions";
list mapping-entry {
key "index";
description
"NAT mapping entry.";
uses mapping-entry;
}
}
}
}
}
/*
* NAT State
*/
container nat-state {
config false;
description
"nat-state";
container nat-instances {
description
"nat instances";
list nat-instance {
key "id";
description
"nat instance";
leaf id {
type int32;
description
"The identifier of the nat instance.";
}
container nat-capabilities {
description
"NAT Capabilities";
leaf nat44-support {
type boolean;
description
"Indicates NAT44 support";
}
leaf nat64-support {
type boolean;
description
"Indicates NAT64 support";
}
leaf port-set-support {
type boolean;
description
"Indicates port set assignment
support ";
}
leaf port-randomization-support {
type boolean;
description
"Indicates whether port randomization is
supported.";
}
leaf port-range-preservation-support {
type boolean;
description
"Indicates whether port range
preservation is supported.";
}
leaf port-preservation-suport {
type boolean;
description
"Indicates whether port preservation
is supported.";
}
leaf port-parity-preservation-support {
type boolean;
description
"Indicates whether port parity preservation is
supported.";
}
leaf address-roundrobin-support {
type boolean;
description
"Indicates whether address allocation
round robin is supported.";
}
leaf ftp-alg-support {
type boolean;
description
"Indicates whether FTP ALG is supported";
}
leaf dns-alg-support {
type boolean;
description
"Indicates whether DNSALG is supported";
}
leaf tftp-support {
type boolean;
description
"Indicates whether TFTP ALG is supported";
}
leaf msrpc-alg-support {
type boolean;
description
"Indicates whether MS-RPC ALG is supported";
}
leaf netbios-alg-support {
type boolean;
description
"Indicates whether NetBIOS ALG is supported";
}
leaf rcmd-alg-support {
type boolean;
description
"Indicates whether rcmd ALG is supported";
}
leaf ldap-alg-support {
type boolean;
description
"Indicates whether LDAP ALG is supported";
}
leaf sip-alg-support {
type boolean;
description
"Indicates whether SIP ALG is supported";
}
leaf rtsp-alg-support {
type boolean;
description
"Indicates whether RTSP ALG is supported";
}
leaf h323-alg-support {
type boolean;
description
"Indicates whether H323 ALG is supported";
}
leaf paired-address-pooling-support {
type boolean;
description
"Indicates whether paired-address-pooling is supported";
}
leaf endpoint-independent-mapping-support {
type boolean;
description
"Indicates whether endpoint-independent-mapping in
section 4 of RFC 4787 is supported.";
}
leaf address-dependent-mapping-support {
type boolean;
description
"Indicates whether endpoint-independent-mapping in
section 4 of RFC 4787 is supported.";
}
leaf address-and-port-dependent-mapping-support {
type boolean;
description
"Indicates whether endpoint-independent-mapping in
section 4 of RFC 4787 is supported.";
}
leaf endpoint-independent-filtering-support {
type boolean;
description
"Indicates whether endpoint-independent-mapping in
section 5 of RFC 4787 is supported.";
}
leaf address-dependent-filtering {
type boolean;
description
"Indicates whether endpoint-independent-mapping in
section 5 of RFC 4787 is supported.";
}
leaf address-and-port-dependent-filtering {
type boolean;
description
"Indicates whether endpoint-independent-mapping in
section 5 of RFC 4787 is supported.";
}
leaf stealth-mode-support {
type boolean;
description
"Indicates whether to respond for unsolicited traffic.";
}
}
container nat-current-config {
description
"current config";
uses nat-parameters;
}
container mapping-table {
description
"Mapping table";
list mapping-entry {
key "index";
description
"mapping entry";
uses mapping-entry;
}
}
container statistics {
description
"Statistics related to the NAT instance";
leaf total-mappings {
type uint32;
description
"Total number of NAT Mappings present
at the time. This includes all the
static and dynamic mappings";
}
leaf total-tcp-mappings {
type uint32;
description
"Total number of TCP Mappings present
at the time.";
}
leaf total-udp-mappings {
type uint32;
description
"Total number of UDP Mappings present
at the time.";
}
leaf total-icmp-mappings {
type uint32;
description
"Total number of ICMP Mappings present
at the time.";
}
container pool-stats {
description
"Statistics related to Pool usage";
leaf pool-id {
type uint32;
description
"Unique Identifier that represents
a pool";
}
leaf address-allocated {
type uint32;
description
"Number of allocated addresses in
the pool";
}
leaf address-free {
type uint32;
description
"Number of free addresses in
the pool.The sum of free
addresses and allocated
addresses are the total
addresses in the pool";
}
container port-stats {
description
"Statistics related to port
usage.";
leaf ports-allocated {
type uint32;
description
"Number of allocated ports
in the pool";
}
leaf ports-free {
type uint32;
description
"Number of free addresses
in the pool";
}
}
}
} //statistics
} //nat-instance
} //nat-instances
} //nat-state
/*
* Notifications
*/
notification nat-event {
description
"Notifications must be generated when the defined
high/low threshold is reached. Related configuration
parameters must be provided to trigger
the notifications.";
leaf id {
type leafref {
path
"/nat-state/nat-instances/"
+ "nat-instance/id";
}
description
"NAT instance ID.";
}
leaf notify-pool-threshold {
type percent;
mandatory true;
description
"A treshhold has been fired.";
}
}
} //module nat
<CODE ENDS>
The YANG module defined in this memo is designed to be accessed via the NETCONF protocol [RFC6241]. The lowest NETCONF layer is the secure transport layer and the support of SSH is mandatory to implement secure transport [RFC6242]. The NETCONF access control model [RFC6536] provides means to restrict access for particular NETCONF users to a pre-configured subset of all available NETCONF protocol operations and contents.
All data nodes defined in the YANG module which can be created, modified and deleted (i.e., config true, which is the default). These data nodes are considered sensitive. Write operations (e.g., edit-config) applied to these data nodes without proper protection can negatively affect network operations.
URI: urn:ietf:params:xml:ns:yang:ietf-nat
Registrant Contact: The IESG.
XML: N/A; the requested URI is an XML namespace.
name: ietf-nat
namespace: urn:ietf:params:xml:ns:yang:ietf-nat
prefix: nat
reference: RFC XXXX
This document requests IANA to register the following URI in the "IETF XML Registry" [RFC3688]: [RFC6020].
| [I-D.boucadair-pcp-yang] | Boucadair, M. and C. Jacquenet, "YANG Data Models for the Port Control Protocol (PCP)", Internet-Draft draft-boucadair-pcp-yang-00, August 2015. |
| [RFC2663] | Srisuresh, P. and M. Holdrege, "IP Network Address Translator (NAT) Terminology and Considerations", RFC 2663, DOI 10.17487/RFC2663, August 1999. |
| [RFC6302] | Durand, A., Gashinsky, I., Lee, D. and S. Sheppard, "Logging Recommendations for Internet-Facing Servers", BCP 162, RFC 6302, DOI 10.17487/RFC6302, June 2011. |
| [RFC6888] | Perreault, S., Yamagata, I., Miyakawa, S., Nakagawa, A. and H. Ashida, "Common Requirements for Carrier-Grade NATs (CGNs)", BCP 127, RFC 6888, DOI 10.17487/RFC6888, April 2013. |