Internet DRAFT - draft-andrews-dnsop-pd-reverse
draft-andrews-dnsop-pd-reverse
Network Working Group M. Andrews
Internet-Draft ISC
Expires: May 9, 2014 November 5, 2013
Automated Delegation of IP6.ARPA reverse zones with Prefix Delegation
draft-andrews-dnsop-pd-reverse-02
Abstract
This document describes a method to automate the delegation of
IP6.ARPA reverse zones when performing Prefix Delegations.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 4
6. Normative References . . . . . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 5
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1. Introduction
This document describes a method to automate the delegation of
IP6.ARPA reverse zones when performing Prefix Delegations.
This will allow home users and small businesses to have IP6.ARPA
zones without manual intervention on the part of the ISP.
2. Method
1) CPE device generates a RSA key pair and stores this in non-
volatile memory.
2) CPE device generates a DHCPv6 Prefix Delegation [RFC3633] request
which includes a KEY-RDATA option (code point TBA), which contains a
the rdata of a DNS KEY record containing a RSASHA256 key using the
public components of the previously generated RSA key pair.
3) DHCP server updates DNS server based on the prefix it is
delegating and the KEY-RDATA, using TSIG [RFC2845] for
authentication, and responds with prefix. If this is a new prefix
delegation, it will clear out all the old DNS records as part of the
delegation process. If there are multiple prefixes being delegated
the ISP's DNS server will be updated for all of them. If the
delegated prefix is not nibble aligned then the server will update
all the reverse apex names that cover the address space, i.e. 1, 2, 4
or 8 KEY records will be added all with the same rdata contents.
4) CPE device configures the nameserver built into it to serve the
reverse of the delegated prefixes. Alternatively it may configure
other nameservers to serve these zones, however the method to do that
is out of scope for this document.
5) CPE device generates a DNS UPDATE [RFC2136] which delegates the
reverse name space to itself and others if they have been configured.
It uses SIG(0) [RFC2931] to sign the request, with owner name
matching the reverse of the delegated prefix.
6) The ISP's DNS server is configured to accept self-signed requests
(the owner name used in the SIG(0) signature matches the owner name
of the data to be updated). It examines the request, looks at the
KEY record added by the DHCPv6 server, and decides whether the
request is valid.
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3. Example
If 2001:DB8:1:4::/62 is delegated then KEY records for
4.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA KEY ...
5.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA KEY ...
6.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA KEY ...
7.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA KEY ...
will be added. The CPE device will configure the nameservers to
serve all of the following zones
4.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA
5.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA
6.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA
7.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA
then will send individual UPDATE messages to delegate each of the
reverse zones.
% nsupdate -k K4.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA
update add 4.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA NS ...
send
% nsupdate -k K5.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA
update add 5.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA NS ...
send
% nsupdate -k K6.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA
update add 6.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA NS ...
send
% nsupdate -k K7.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA
update add 7.0.0.0.1.0.0.0.8.B.D.0.1.0.0.2.IP6.ARPA NS ...
send
4. IANA Considerations
Allocate a DHCPv6 code point for KEY-RDATA.
5. Security Considerations
The UPDATE requests are all signed. This is a proven method for
securing UPDATE requests in the DNS.
As a RSA key is being used there is no issue with key material being
sent in the clear.
Only the CPE device and the ISP itself is capable of creating,
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updating or destroying the delegation.
6. Normative References
[RFC2136] Vixie, P., Thomson, S., Rekhter, Y., and J. Bound,
"Dynamic Updates in the Domain Name System (DNS UPDATE)",
RFC 2136, April 1997.
[RFC2845] Vixie, P., Gudmundsson, O., Eastlake, D., and B.
Wellington, "Secret Key Transaction Authentication for DNS
(TSIG)", RFC 2845, May 2000.
[RFC2931] Eastlake, D., "Secret Key Transaction Authentication for
DNS (TSIG)", RFC 2931, September 2000.
[RFC3633] Troan, O. and R. Droms, "IPv6 Prefix Options for Dynamic
Host Configuration Protocol (DHCP) version 6", RFC 3633,
December 2003.
Author's Address
M. Andrews
Internet Systems Consortium
950 Charter Street
Redwood City, CA 94063
US
Email: marka@isc.org
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