DNS UDP or TCP?
Brad Knowles
brad.knowles at skynet.be
Thu Sep 27 01:54:49 UTC 2001
At 4:32 PM -0700 9/26/01, Chris Parker wrote:
> Are DNS queries UDP or TCP?
Depends. By default, DNS queries use UDP, but if there is a
truncation in the response (i.e., it won't fit into a 512-byte UDP
packet), then the server is responsible for retrying the query using
TCP. TCP is also used for zone transfers. And for any particular
query, you can specify if you want to use TCP instead of UDP (for
whatever reason).
--
Brad Knowles, <brad.knowles at skynet.be>
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