[ILUG] DNS messages
james-ilug at now.ie
Mon Dec 4 14:47:37 GMT 2000
On Mon, Dec 04, 2000 at 02:28:01PM +0000, Tomas Winston wrote:
> Anyone know what mechanism is used in sending messages to and from DNS
> servers? Is RPC used or can it be? I'd appreciate any help.
DNS uses UDP datagrams for DNS packets less than 512 bytes in size,
and TCP streams for packets greater than that.
The basic layout of a DNS packet is described in RFC 1035 (and others)
and the O'Reilly book, "DNS & BIND" is an excellent reference. Watch out
for the 4th Ed., due RSN.
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