is notify message going with UDP or TCP?

[Joseph S D Yao]

On Mon, Mar 28, 2011 at 08:30:00PM +0800, terry wrote:
> BIND master sends the notify message with TCP or UDP protocal?


RFC 1996:

   3.4. The transport protocol used for a NOTIFY transaction will be UDP
   unless the master has reason to believe that TCP is necessary; for
   example, if a firewall has been installed between master and slave,
   and only TCP has been allowed; or, if the changed RR is too large to
   fit in a UDP/DNS datagram.


So, JUST AS WITH RESPONSES TO QUERIES, both UDP and TCP must be allowed
for reliable service.


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** Joe Yao				jsdy at tux.org - Joseph S. D. Yao
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