I believe DNS lookups will ordinarily use UDP but may use TCP for larger
transfers (like the 20 addresses returned for yahoo.com).
It is my understanding (and experience) that DNS requires both UDP 53 and
TCP 53 open through a firewall to avoid problems.
Mike
On Mon, 19 Dec 2005, ed wrote:
On Mon, 19 Dec 2005 23:29:08 +0000
"Karl O. Pinc" <[EMAIL PROTECTED]> wrote:
Would it be because dns sometimes talks UDP? (I forget the
details.)
Contrary to other people's views on this list I prefer DNS to talk UDP.
It's quicker for one thing as the query takes place in fewer bytes.
If UDP is not possible then the protocol should retry in TCP, IIRC.
--
Regards, Ed http://www.usenix.org.uk - http://irc.is-cool.net
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