[96102] in North American Network Operators' Group
Re: DHCPv6, was: Re: IPv6 Finally gets off the ground
daemon@ATHENA.MIT.EDU (Jeroen Massar)
Mon Apr 16 20:21:23 2007
Date: Tue, 17 Apr 2007 01:16:21 +0100
From: Jeroen Massar <jeroen@unfix.org>
To: "Chris L. Morrow" <christopher.morrow@verizonbusiness.com>
Cc: Stephen Sprunk <stephen@sprunk.org>,
Fred Heutte <aoxomoxoa@sunlightdata.com>,
North American Noise and Off-topic Gripes <nanog@merit.edu>
In-Reply-To: <Pine.GSO.4.58.0704162354260.12021@marvin.argfrp.us.uu.net>
Errors-To: owner-nanog@merit.edu
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Chris L. Morrow wrote:
[..]
> the STSN devices? or 'ibahn' ? One thing to keep in mind is that the
> DNS-LB used by Google/yahoo (in the examples above) seems to be returni=
ng
> a CNAME for AAAA queries, then nothing for the follow-up resolution
> request for a AAAA for the CNAME... So, ipv6 things may look 'broken'
> because they are also 'slow' (waiting to re-do much of the lookup path =
to
> get the A version)
(snipped for brevity)
8<-------------------------------------------------------------------
$ dig @ns1.google.com www.google.com aaaa
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41689
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 7, ADDITIONAL: 7
;; ANSWER SECTION:
www.google.com. 604800 IN CNAME www.l.google.com.
$ dig @ns1.google.com www.l.google.com aaaa
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44383
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 7, ADDITIONAL: 7
------------------------------------------------------------------->8
8<-------------------------------------------------------------------
$ dig @ns5.yahoo.com www.yahoo.com. aaaa
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 3095
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 13, ADDITIONAL: 0
;; ANSWER SECTION:
www.yahoo.com. 300 IN CNAME www.yahoo-ht3.akadns.net.=
$ dig @eur1.akadns.net www.yahoo-ht3.akadns.net. aaaa
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15024
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
------------------------------------------------------------------->8
The Yahoo redirect is out of bailiwick and thus requires a full lookup
again, the google one at least can be served by the same box.
But for the rest it all seems pretty fine to me...
or do you mean that those ibahn things see "NOERROR" and then no
answers, thus wrongly cache that as label has 0 answers at all?
or what I mention above with the redirect?
Greets,
Jeroen
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