port 53 tcp/udp
marka at isc.org
Tue Jul 17 21:43:34 UTC 2012
In message <20120717194840.GA3773 at glasya2>, nex6 writes:
> when does bind or dns in general use tcp and when does it use udp?
When it needs to. TCP support is NOT optional.
> from what i have read, from the client intial request if under 512b
> come in on UDP port 53, if and depending on the local
> resolver in needs to retry it *could* be a tcp port 53 request?
> now thats client to name server;
> what about, recursive lookups? or forwarded requests? etc
It's still client to server. Recursive servers have a client side
and a server side.
> how does that work?
Exactly the same why.
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Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka at isc.org
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