On May 4, 2009, at 7:28 PM, Martin McCormick wrote:
When are tcp dns queries necessary?It was my understanding that clients could user tcp or udp.
When a response can not fit in a single UDP packet the server will mark the truncated flag (and respond with all the data it can inside the UDP packet). That should trigger a client to resubmit the query via TCP. Zone transfers are the most common use for TCP, but it can be required for normal queries, although that is far from normal.
-- Matt Baxter [email protected] _______________________________________________ bind-users mailing list [email protected] https://lists.isc.org/mailman/listinfo/bind-users
