BIND 9.2.1 and TCP
Mark_Andrews at isc.org
Mark_Andrews at isc.org
Thu Nov 7 06:19:05 UTC 2002
>
> The request is for a single A record, ( nash 3600 IN A 192.168.0.1 ), would t
> his be too large to fit in a UDP packet. Also we have BIND 8 servers that se
> rve the same information and they do not revert to TCP for these records. Co
> uld this possibly be a misconfiguration on my part, or is there no way to res
> trict the server to only using udp?
> Thanks,
> Zack
Why don't you show us what 'dig +ignoretc +search <name>' returns
then 'dig +search <name>'.
Mark
>
> -----Original Message-----
> From: Mark.Andrews at isc.org [mailto:Mark.Andrews at isc.org]
> Sent: Wednesday, November 06, 2002 4:25 PM
> To: Nash, Zack
> Cc: bind-users at isc.org
> Subject: Re: BIND 9.2.1 and TCP
>
>
>
> > Hello,
> > I have noticed that my BIND 9.2.1 servers are requesting that my DNS Cl
> > ients use TCP rather than UDP to resolve hostnames, for all queries against
> t
> > his server.
> > My understanding is that UDP is used unless the packet is too large the
> > n the server will request a TCP connection from the client. I have seen th
> is
> > occur for queries of a single A record. Is this behavior a bug or is this
> a
> > new standard that is being implemented with the advent of BIND 9?
> > Thanks,
> > Zack
>
> Well the answers must be too big to fit in the space available in a
> UDP response. Remember the authority section can also trigger TC.
>
> Mark
> --
> Mark Andrews, Internet Software Consortium
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at isc.org
>
>
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at isc.org
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