DNS problems to RoadRunner - tcp vs udp

Fri Jun 13 18:14:55 UTC 2008

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Mark Price wrote:
<SNIP>
>>From what I have read, public DNS servers should support both UDP and
> TCP queries.  TCP queries are often used when a UDP query fails, or if
> the answer is over a certain length.
> 

UDP is used for queries.

TCP is used for zone transfers.

If my server responded to TCP queries from anyone other than a secondary
server, I would be VERY concerned.

Jon Kibler
- --
Jon R. Kibler
Chief Technical Officer
Advanced Systems Engineering Technology, Inc.
Charleston, SC  USA
o: 843-849-8214
c: 843-224-2494
s: 843-564-4224

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