[105162] in North American Network Operators' Group
Re: DNS problems to RoadRunner - tcp vs udp
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Fri Jun 13 14:19:33 2008
To: Jon.Kibler@aset.com
In-Reply-To: Your message of "Fri, 13 Jun 2008 14:14:55 EDT."
<4852B91F.8090205@aset.com>
From: Valdis.Kletnieks@vt.edu
Date: Fri, 13 Jun 2008 14:19:09 -0400
Cc: nanog@merit.edu
Errors-To: nanog-bounces@nanog.org
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On Fri, 13 Jun 2008 14:14:55 EDT, Jon Kibler said:
> UDP is used for queries.
>
> TCP is used for zone transfers.
It's also sometimes used if a reply doesn't fit in the 512 bytes for a
UDP answer and EDNS0 isn't in effect. You get a truncated UDP packet back
and re-ask the query over TCP.
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