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List: fedora-test-list
Subject: Re: DNS resolving problems
From: Stelian Iancu <stelian.iancu () gmx ! net>
Date: 2006-02-15 20:07:57
Message-ID: 1140055717.3147.4.camel () paradise ! siancu ! net
[Download RAW message or body]
> 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@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
["tcpdump.dns.log" (tcpdump.dns.log)]
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 8192 bytes
000000 arp who-has 192.168.2.3 tell 192.168.2.1
950445 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto: UDP (17), length: 60) \
192.168.2.61.32789 > 192.168.2.1.domain: [udp sum ok] 39458+ A? www.redhat.com. (32) \
034537 IP (tos 0x0, ttl 64, id 16752, offset 0, flags [none], proto: UDP (17), \
length: 76) 192.168.2.1.domain > 192.168.2.61.32789: [udp sum ok] 39458 q: A? \
www.redhat.com. 1/0/0 www.redhat.com. A 209.132.177.50 (48) 001296 IP (tos 0x0, ttl \
64, id 0, offset 0, flags [DF], proto: UDP (17), length: 60) 192.168.2.61.32790 > \
192.168.2.1.domain: [udp sum ok] 64721+ AAAA? www.redhat.com. (32) 002781 IP (tos \
0x0, ttl 64, id 16753, offset 0, flags [none], proto: UDP (17), length: 76) \
192.168.2.1.domain > 192.168.2.61.32789: [udp sum ok] 39458 q: A? www.redhat.com. \
1/0/0 www.redhat.com. A 209.132.177.50 (48) 000179 IP (tos 0xc0, ttl 64, id 27297, \
offset 0, flags [none], proto: ICMP (1), length: 104) 192.168.2.61 > 192.168.2.1: \
ICMP 192.168.2.61 udp port 32789 unreachable, length 84 IP (tos 0x0, ttl 64, id \
16753, offset 0, flags [none], proto: UDP (17), length: 76) 192.168.2.1.domain > \
192.168.2.61.32789: [udp sum ok] 39458 q: A? www.redhat.com. 1/0/0 www.redhat.com. A \
209.132.177.50 (48) 004936 IP (tos 0x0, ttl 64, id 16754, offset 0, flags [none], \
proto: UDP (17), length: 76) 192.168.2.1.domain > 192.168.2.61.32789: [udp sum ok] \
39458 q: A? www.redhat.com. 1/0/0 www.redhat.com. A 209.132.177.50 (48) 000193 IP \
(tos 0xc0, ttl 64, id 27298, offset 0, flags [none], proto: ICMP (1), length: 104) \
192.168.2.61 > 192.168.2.1: ICMP 192.168.2.61 udp port 32789 unreachable, length 84 \
IP (tos 0x0, ttl 64, id 16754, offset 0, flags [none], proto: UDP (17), length: 76) \
192.168.2.1.domain > 192.168.2.61.32789: [udp sum ok] 39458 q: A? www.redhat.com. \
1/0/0 www.redhat.com. A 209.132.177.50 (48) 029030 IP (tos 0x0, ttl 64, id 16759, \
offset 0, flags [none], proto: UDP (17), length: 76) 192.168.2.1.domain > \
192.168.2.61.32789: [udp sum ok] 39458 q: A? www.redhat.com. 1/0/0 www.redhat.com. A \
209.132.177.50 (48) 000197 IP (tos 0xc0, ttl 64, id 27299, offset 0, flags [none], \
proto: ICMP (1), length: 104) 192.168.2.61 > 192.168.2.1: ICMP 192.168.2.61 udp port \
32789 unreachable, length 84 IP (tos 0x0, ttl 64, id 16759, offset 0, flags [none], \
proto: UDP (17), length: 76) 192.168.2.1.domain > 192.168.2.61.32789: [udp sum ok] \
39458 q: A? www.redhat.com. 1/0/0 www.redhat.com. A 209.132.177.50 (48) 005950 IP \
(tos 0x0, ttl 64, id 16760, offset 0, flags [none], proto: UDP (17), length: 60) \
192.168.2.1.domain > 192.168.2.61.32790: [udp sum ok] 64721 q: AAAA? www.redhat.com. \
0/0/0 (32) 001894 IP (tos 0x0, ttl 64, id 16761, offset 0, flags [none], proto: UDP \
(17), length: 60) 192.168.2.1.domain > 192.168.2.61.32790: [udp sum ok] 64721 q: \
AAAA? www.redhat.com. 0/0/0 (32) 000357 IP (tos 0x0, ttl 64, id 0, offset 0, flags \
[DF], proto: UDP (17), length: 60) 192.168.2.61.32791 > 192.168.2.1.domain: [udp sum \
ok] 59059+ MX? www.redhat.com. (32) 004564 IP (tos 0x0, ttl 64, id 16762, offset 0, \
flags [none], proto: UDP (17), length: 60) 192.168.2.1.domain > 192.168.2.61.32790: \
[udp sum ok] 64721 q: AAAA? www.redhat.com. 0/0/0 (32) 000174 IP (tos 0xc0, ttl 64, \
id 27300, offset 0, flags [none], proto: ICMP (1), length: 88) 192.168.2.61 > \
192.168.2.1: ICMP 192.168.2.61 udp port 32790 unreachable, length 68 IP (tos 0x0, \
ttl 64, id 16762, offset 0, flags [none], proto: UDP (17), length: 60) \
192.168.2.1.domain > 192.168.2.61.32790: [udp sum ok] 64721 q: AAAA? www.redhat.com. \
0/0/0 (32) 027685 IP (tos 0x0, ttl 64, id 16767, offset 0, flags [none], proto: UDP \
(17), length: 60) 192.168.2.1.domain > 192.168.2.61.32790: [udp sum ok] 64721 q: \
AAAA? www.redhat.com. 0/0/0 (32) 000177 IP (tos 0xc0, ttl 64, id 27301, offset 0, \
flags [none], proto: ICMP (1), length: 88) 192.168.2.61 > 192.168.2.1: ICMP \
192.168.2.61 udp port 32790 unreachable, length 68 IP (tos 0x0, ttl 64, id 16767, \
offset 0, flags [none], proto: UDP (17), length: 60) 192.168.2.1.domain > \
192.168.2.61.32790: [udp sum ok] 64721 q: AAAA? www.redhat.com. 0/0/0 (32) 004672 IP \
(tos 0x0, ttl 64, id 16768, offset 0, flags [none], proto: UDP (17), length: 60) \
192.168.2.1.domain > 192.168.2.61.32791: [udp sum ok] 59059 q: MX? www.redhat.com. \
0/0/0 (32) 006524 IP (tos 0x0, ttl 64, id 16769, offset 0, flags [none], proto: UDP \
(17), length: 60) 192.168.2.1.domain > 192.168.2.61.32791: [udp sum ok] 59059 q: MX? \
www.redhat.com. 0/0/0 (32) 000199 IP (tos 0xc0, ttl 64, id 27302, offset 0, flags \
[none], proto: ICMP (1), length: 88) 192.168.2.61 > 192.168.2.1: ICMP 192.168.2.61 \
udp port 32791 unreachable, length 68 IP (tos 0x0, ttl 64, id 16769, offset 0, \
flags [none], proto: UDP (17), length: 60) 192.168.2.1.domain > 192.168.2.61.32791: \
[udp sum ok] 59059 q: MX? www.redhat.com. 0/0/0 (32) 003814 IP (tos 0x0, ttl 64, id \
16770, offset 0, flags [none], proto: UDP (17), length: 60) 192.168.2.1.domain > \
192.168.2.61.32791: [udp sum ok] 59059 q: MX? www.redhat.com. 0/0/0 (32) 004127 IP \
(tos 0x0, ttl 64, id 16771, offset 0, flags [none], proto: UDP (17), length: 60) \
192.168.2.1.domain > 192.168.2.61.32791: [udp sum ok] 59059 q: MX? www.redhat.com. \
0/0/0 (32) 2. 411985 arp who-has 192.168.2.3 tell 192.168.2.1
5. 429607 arp who-has 192.168.2.3 tell 192.168.2.1
1. 184057 arp who-has 192.168.2.3 tell 192.168.2.1
25 packets captured
50 packets received by filter
0 packets dropped by kernel
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