DNS resolving problems
Stelian Iancu
stelian.iancu at gmx.net
Thu Feb 16 02:08:36 UTC 2006
> Hi Stelian -
>
Hello, please see my comments inside.
> We'd need some more details to be able to advise :
>
> 1. How is your resolver set up ?
>
> Are you using only /etc/resolv.conf and the glibc resolver,
> or are you running a local caching-nameserver (named) ?
Only resolv.conf, no named.
> Are you using NetworkManager ?
Yes, but only starting from today. Yesterday I've updated from FC5 Test
2 to rawhide and, before that, in FC5 Test 2 I didn't use NetworkManager
and the behavior was the same.
BTW, I am using a wireless connection (I don't know if it's relevant or
not).
> Are you using nscd ?
No.
> What does your /etc/nsswitch.conf 'hosts:' line say ?
>
hosts: files dns
> 2. Please quantify the problem - send us the /tmp/tcpdump.dns.log created by:
> # tcpdump -vvv -ttt -nl -s 8192 -i any port domain >/tmp/tcpdump.dns.log 2>&1 &
> # host a.name.that.takes.a.long.time.to.resolve
> # pkill tcpdump
>
I've ran tcpdump with the syntax you've provided (I hope I did it
correctly :-), here is the log. It seemed pretty fast to me (to resolve
redhat.com), however, once I try it in Firefox, for example, it takes a
much longer time.
> NOTE: previous response to this issue:
> On Wednesday 15 February 2006 13:53, John Reiser <jreiser at bitwagon.com> wrote:
> > Is the code waiting for timeout of non-existent IP6 routing?
> > If so, then disable IP6.
> This problem has been fixed for a long time in BIND, and should not be
> a problem with glibc resolver - do you have any resolv.conf options settings ?
I don't have any resolv.conf options settings, only the nameserver
line.
>
> Thanks & Regards,
> Jason Vas Dias
> BIND package maintainer
> Red Hat Inc.
Many thanks!
Stelian
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