On 20.10.11 16:11, Karl Auer wrote:
Date: Thu, 20 Oct 2011 16:11:03 +1100
From: Karl Auer <ka...@biplane.com.au>
To: BIND users <bind-us...@isc.org>
Subject: Re: intermittent bad horizontal referral?
Someone wrote (privately, so I'm not giving a name):
There's a bit of problem with the DNS. You might want to jump over to
http://dns.squish.net/ and run an NS traversal for biplane.com.au --
pps.com.au's DNS is befuddled.
This is true. Two of the four PPS nameservers do not have glue records
in .com.au. What I don't understand is how a trace can compete at all,
if there is no glue.
There are glues for some of pps.com.au servers in com.au zone.
So, some glue records exists, alth0ougn not all that should exist.
However that's enough for the resolution to work.
If there are no referrals to x.com.au in .com.au, how can a query "jump
the gap"? Because I can see that happening in a trace. Here are two
traces for pps.com.au. The first shows referrals in .com.au, the second
does not. It looks as if n.au somehow answered directly, but g.au did
not.
n.au seems to handle both .au and .com.au, while s.au (not g.au) only
handles .au, so it sent referral to com.au servers.
au. 172800 IN NS o.au.
au. 172800 IN NS n.au.
au. 172800 IN NS a.au.
au. 172800 IN NS l.au.
au. 172800 IN NS m.au.
au. 172800 IN NS r.au.
au. 172800 IN NS h.au.
au. 172800 IN NS p.au.
au. 172800 IN NS s.au.
au. 172800 IN NS u.au.
au. 172800 IN NS v.au.
au. 172800 IN NS b.au.
;; Received 496 bytes from 192.112.36.4#53(g.root-servers.net) in 348 ms
com.au. 172800 IN NS q.au.
com.au. 172800 IN NS j.au.
com.au. 172800 IN NS i.au.
com.au. 172800 IN NS h.au.
com.au. 172800 IN NS o.au.
com.au. 172800 IN NS l.au.
com.au. 172800 IN NS g.au.
com.au. 172800 IN NS n.au.
com.au. 172800 IN NS m.au.
com.au. 172800 IN NS p.au.
com.au. 172800 IN NS k.au.
;; Received 408 bytes from 2607:f140:ffff:fffe::e#53(s.au) in 193 ms
pps.com.au. 14400 IN NS ppsdns6.pps.com.au.
pps.com.au. 14400 IN NS ppsdns4.pps.com.au.
pps.com.au. 14400 IN NS ppsdns2.pps.com.au.
pps.com.au. 14400 IN NS ppsdns1.pps.com.au.
pps.com.au. 14400 IN NS ppsdns3.pps.com.au.
;; Received 214 bytes from 202.65.12.72#53(i.au) in 16 ms
[deleted]
au. 172800 IN NS b.au.
au. 172800 IN NS r.au.
au. 172800 IN NS a.au.
au. 172800 IN NS o.au.
au. 172800 IN NS p.au.
au. 172800 IN NS v.au.
au. 172800 IN NS l.au.
au. 172800 IN NS m.au.
au. 172800 IN NS n.au.
au. 172800 IN NS h.au.
au. 172800 IN NS s.au.
au. 172800 IN NS u.au.
;; Received 496 bytes from 2001:dc3::35#53(m.root-servers.net) in 178 ms
pps.com.au. 14400 IN NS ppsdns3.pps.com.au.
pps.com.au. 14400 IN NS ppsdns2.pps.com.au.
pps.com.au. 14400 IN NS ppsdns4.pps.com.au.
pps.com.au. 14400 IN NS ppsdns1.pps.com.au.
pps.com.au. 14400 IN NS ppsdns6.pps.com.au.
;; Received 214 bytes from 69.36.145.34#53(n.au) in 227 ms
--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
Depression is merely anger without enthusiasm.
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