udp vs tcp query

Noel Butler noel.butler at ausics.net
Sun Oct 23 03:56:21 UTC 2011

I think you have something broken, bind uses UDP by default, if it can
not connect to a dns server on UDP it then retries on TCP.

It also uses TCP for AXFR's

On Sun, 2011-10-23 at 05:50 +0200, Benny Pedersen wrote:

> On Sat, 22 Oct 2011 20:42:08 -0700, Kevin Oberman wrote:
> > On Sat, Oct 22, 2011 at 8:24 PM, Benny Pedersen <me at junc.org> wrote:
> >> can i control this pr zone when bind is dns client ?
> >> remote server is rbldnsd with is not supporting tcp, how to solve 
> >> this ?
> >
> > You have a badly broken DNS if it does not support TCP. You need to
> > fix this. Anything else is a band-aid that will just keep breaking
> > things.
> thanks, its good to know that i am right rbldnsd is not working if its 
> not supporting tcp, i just ask if i can make bind always use udp to 
> zones that are known to be udp only servers
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