TechNote

[Mark_Andrews at isc.org]

> Hello,
> 
> I used configuration as showed in TN but my DIG (9.2.1) seems to use a very
> old IPv& REVERSE DNS resolving sheme:

	No.  It actually uses what was until very recently the way to go.
	There have been three schema for reverse lookups.

	RFC 1886: nibble + ip6.int
	RFC 2874: bitstring + ip6.arpa
	(draft-ietf-dnsext-ipv6-dns-tradeoffs-02.txt + RFC 3152):
	nibble + ip6.arpa

> root at arktis:/etc/bind# dig -x 3ffe:b80:4f6::ffff:ffff:ffff:fffe
> 
> ; <<>> DiG 9.2.1 <<>> -x 3ffe:b80:4f6::ffff:ffff:ffff:fffe
> ;; global options: printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 18572
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
> 
> ;; QUESTION SECTION:
> ;\[x3FFE0B8004F60000FFFFFFFFFFFFFFFE/128].ip6.arpa. IN PTR
> 
> ;; AUTHORITY SECTION:
> ip6.arpa. 10617 IN SOA dns1.icann.org.
> hostmaster.icann.org. 2002071701 3600 1800 604800 10800
> 
> ;; Query time: 2 msec
> ;; SERVER: 195.206.105.1#53(195.206.105.1)
> ;; WHEN: Wed Aug 28 00:45:15 2002
> ;; MSG SIZE rcvd: 105
> 
> Will this change in future versions??

	Yes.  The default will become nibble ip6.arpa in BIND 9.3.

	If you had done "dig -n -x 3ffe:b80:4f6::ffff:ffff:ffff:fffe" you
	would have seen the DNAME in action.

	Mark
> 
> Marc
> 
> 
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org