Re: What port shoud be opened for the dns server

From: Mark Damrose (mdamrose@elgin.cc.il.us)
Date: 07/15/02 

From: "Mark Damrose" <mdamrose@elgin.cc.il.us>
Date: Mon, 15 Jul 2002 09:48:29 -0500

"Kasper Dupont" <kasperd@daimi.au.dk> wrote in message
news:3D303565.1859CD5D@daimi.au.dk...
> svek wrote:
> >
> > "Mark Damrose" <mdamrose@elgin.cc.il.us> wrote in
> > news:agp6d3$nlkc8$1@ID-125530.news.dfncis.de:
> >
> > > It's actually the response. The initial request is almost always made
> > > with udp. If the response does not fit in 1 packet (512 bytes IIRC)
> > > then a bit is set to indicate the response was truncated, and the
> > > client should retry with tcp.
>
> What if the domainname you want to look up is longer than
> 512 bytes?

Then the initial request would not fit into 512 bytes and tcp would be used.
There is no requirement that the client use udp at all. It's just that most
do.

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