Timeout on DNS Request with Bind

[Mark Andrews]

> Hello,
> 
> I am writing here because I have a strange problem with a BIND 9.2.4

	Upgrade.

> installed on a Sarge Box. In my previous LAN architecture, this box was
> directely connected to internet via a PPPoE connection. In that
> configuration, there was no problem : The BIND resolved quickly the
> requests.
> 
> Then I changed my architecture and installed a Speedtouch Router between
> the Debian and the Internet and since this moment some outgoing requests
>  time out.
> 
> Here is an example :
> 
> C:\Documents and Settings\ptitoliv>nslookup
> Serveur par dÚfaut :  gatekeeper.ptitoliv.lan
> Address:  192.168.1.2
> 
> > host google.com
> DNS request timed out.
>     timeout was 2 seconds.
> DNS request timed out.
>     timeout was 2 seconds.
> *** Impossible de trouver l'adresse pour le serveur google.com : Timed out
> > host google.com
> Serveur :  google.com
> Addresses:  64.233.187.99, 72.14.207.99, 64.233.167.99
> >
> 
> I tried to tcpdump and I saw that my bind server wait a little moment
> before connecting to the root servers in order to make the resolution.

	No.  You saw them wait to connect to the COM servers.
 
> So in a temporary way, I put my ISP Dns as a forwarder and in that case,
> I have no time out problem.
> 
> Does anybody knows why bind can have this behaviour ?
> 
> Thanks for your answers
> 
> Regards,
> Olivier BONHOMME
> 
> 
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org