On 2007-12-26 Dan Shoop wrote:
> On Dec 24, 2007, at 11:18 AM, David Haines wrote:
>> Check your rules and realize that DNS uses TCP & UDP port 53.
>> http://docs.info.apple.com/article.html?artnum=106439
>
> Yes and no. DNS typically is UDP. We don't need a reliable(*) IP
> connection for DNS.
>
> (*) in the IP sense of the word.
DNS uses TCP not only for zone transfers, but generally as a fallback
when it needs to transmit responses that won't fit into a single UDP
datagram. Thus one needs both 53/udp and 53/tcp for DNS to be fully
operational.
Regards
Ansgar Wiechers
--
"Another option [for defragmentation] is to back up your important files,
erase the hard disk, then reinstall Mac OS X and your backed up files."
--http://docs.info.apple.com/article.html?artnum=25668
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