DNS problems to RoadRunner - tcp vs udp

Valdis.Kletnieks at vt.edu Valdis.Kletnieks at vt.edu
Fri Jun 13 13:19:09 CDT 2008


On Fri, 13 Jun 2008 14:14:55 EDT, Jon Kibler said:

> UDP is used for queries.
> 
> TCP is used for zone transfers.

It's also sometimes used if a reply doesn't fit in the 512 bytes for a
UDP answer and EDNS0 isn't in effect.  You get a truncated UDP packet back
and re-ask the query over TCP.
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