Both TCP and UDP

Cricket Liu cricket at acmebw.com
Tue Jul 20 17:46:14 UTC 1999


>     I heard today that the DNS app is both TCP and UDP. Please confirm
> and explain.

"The DNS app"?

Nearly all DNS resolvers and servers use UDP for queries and responses by
default, but both resolvers and servers may resort to using TCP for queries
(in which case the response is sent over the same connection) if they
receive truncated UDP responses.

cricket

Acme Byte & Wire
cricket at acmebw.com
www.acmebw.com

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