4 second delay on lookups
Ivo Sabev
summerborn at gmail.com
Fri Jul 7 18:55:31 UTC 2006
> -----Original Message-----
> From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org] On
> Behalf Of Gavin Hamill
> Sent: Friday, July 07, 2006 8:51 PM
> To: bind-users at isc.org
> Subject: 4 second delay on lookups
>
> Hi :)
>
> I'm running BIND 9.2.4 as provided by Debian in the Sarge distribution,
> and am finally getting round to looking at a problem that has bugged
> me for months.
>
> A tcpdump will easily tell the story. Client PC is 10.0.0.29, gateway
> is 10.0.0.1 on the LAN and 80.192.144.33 on the WAN.
>
> Gateway machine, LAN interface:
> 18:03:01.962740 IP 10.0.0.29.32782 > 10.0.0.1.53: 38294+ A? sun.com.(25)
> 18:03:06.284149 IP 10.0.0.1.53 > 10.0.0.29.32782: 38294 1/4/0 A
> 72.5.124.61 (113)
>
> Gateway machine, WAN interface:
> 18:03:05.966780 IP 80.192.144.33.32768 > 192.52.178.30.53: 31993 A?
> sun.com. (25)
> 18:03:05.999320 IP 192.52.178.30.53 > 80.192.144.33.32768: 31993-
> 0/4/4 (161)
> 18:03:06.001387 IP 80.192.144.33.32768 > 192.18.99.5.53: 28178% [1au]
> A? sun.com. (36)
> 18:03:06.138290 IP 192.18.99.5.53 > 80.192.144.33.32768: 28178 FormErr
> [0q] 0/0/0 (12)
> 18:03:06.139178 IP 80.192.144.33.32768 > 192.18.99.5.53: 56235 A?
> sun.com. (25)
> 18:03:06.282613 IP 192.18.99.5.53 > 80.192.144.33.32768: 56235*- 1/4/4
> A 72.5.124.61 (177)
>
> There is exactly a 4-second wait between BIND receiving a request and
> asking a root-server where it can find NS for sun.com - why? :)
>
> A cursory search has brought up
> http://www.redhat.com/archives/nahant-list/2005-October/msg00375.html
>
> but I don't wish to disable IPv6 (even though I'm not using it at
> present) - what can I do to get more information and eliminate this
> delay?
>
> My named.conf is trivial + stock-Debian.. nothing in options {} except
> the directory "/var/cache/bind";, no logging {} and only root,
> localhost, (127, 0, 255) in-addr.arpa zones...
>
> Cheers,
> Gavin.
Hello,
Why not to try to start named with "-4" option for listening only on ipv4
addresses.
Can somebody, who is more experienced than me to tell if this would help?
Best regards Ivo Sabev
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