nanog mailing list archives
Re: Repotting report
From: Leo Bicknell <bicknell () ufp org>
Date: Mon, 4 Feb 2008 20:21:27 -0500
In a message written on Mon, Feb 04, 2008 at 07:50:50PM -0500, Kevin Loch wrote:
There is an interesting variation in what records are returned for a standard 512 byte request (dig ns . @[x].root-servers.net): A,C,D,E,F,G,I,J: return the same 10 A records and 4 AAAA records in the same order every time. They never return A records for K,L,M and never get AAAA records for K,M. B: returns all 13 A records in random order and then two AAAA records in random order. This allows all records to be returned with equal weight within each record type. H,K,L,M: return all 13 A records in static order and then A and F AAAA records so H,J,K,M AAAA records are never returned. Tested with dig 9.4.1-p1 on a v6 enabled system.
I concur. An interesting thing I noticed that doesn't really cause an operational problem but may confuse some people is their behavior is also quite different when queried for "any". If your a lazy admin like me who is used to typing "dig any foo" for testing you may try "dig any . @[a-m].root-servers.net." When I do that, I get the following response: a, c, d e, f, g, i and j return 1 SOA, 8 A, and 3 AAAA's (the first 3). b, h, l, k, and m return 1 SOA, 13 A, no AAAA records. If you make this mistake you might think b, h, l, k and m have no IPv6 data, which is wrong. Querying with NS (as nameserver would do) clearly shows that. While a cosmetic problem, I fear it may confuse a number of admins as the troubleshoot problems in the near future. -- Leo Bicknell - bicknell () ufp org - CCIE 3440 PGP keys at http://www.ufp.org/~bicknell/
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Current thread:
- Repotting report Iljitsch van Beijnum (Feb 04)
- Re: Repotting report Leo Bicknell (Feb 04)
- Re: Repotting report Iljitsch van Beijnum (Feb 04)
- Re: Repotting report Leo Bicknell (Feb 04)
- Re: Repotting report Joe Abley (Feb 04)
- Re: Repotting report Leo Bicknell (Feb 04)
- Re: Repotting report David Conrad (Feb 04)
- Re: Repotting report Mark Andrews (Feb 04)
- Re: Repotting report Iljitsch van Beijnum (Feb 04)
- Re: Repotting report Kevin Loch (Feb 04)
- Re: Repotting report Leo Bicknell (Feb 04)
- Re: Repotting report Pekka Savola (Feb 04)
- Re: Repotting report Christopher Morrow (Feb 05)
- Re: Repotting report Mark Andrews (Feb 05)
- Re: Repotting report Christopher Morrow (Feb 05)
- Re: Repotting report Mark Andrews (Feb 05)
- Re: Repotting report John Payne (Feb 06)
- Re: Repotting report Mark Andrews (Feb 06)
- Re: Repotting report Leo Bicknell (Feb 04)