Public bug reported:
My laptop is an Ubuntu Intrepid system with IPv6 enabled, which I use
regularly without problems. Recently, however, the glibc resolver has
been acting strangely after one of my network environments installed the
powerdns DNS server.
Contents of /etc/resolv.conf (from DHCP):
---
domain company.local
search company.local
nameserver 10.0.0.1
---
Resolving queries fails on my laptop if I use fully qualified names for which
the powerdns server is authoritative:
# getent hosts host001.company.local.
[timeout]
But if I just use relative names:
# getent hosts host001
10.0.0.2 host001.company.local
If I try resolving a server for which the powerdns server is *not*
authoritative:
# getent hosts www.xs4all.nl.
194.109.6.92 www.xs4all.nl
I think I have traced the problem to the fact that powerdns replies with
"no such domain" when queried for a name for which an AAAA record does
not exist. Bind will just reply with an empty result. Apparently, the
glibc resolver will retry for an A records only if the name to be
resolved is not fully qualified!?
I have attached a tcpdump from the DNS traffic resulting from the above
commands.
Ubuntu 8.10
libc6 2.8~20080505-0ubuntu7
powerdns 3.1.7
** Affects: glibc (Ubuntu)
Importance: Undecided
Status: New
--
resolver does not (always) try A record after query for AAAA returns NXDOMAIN
https://bugs.launchpad.net/bugs/291589
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