15 Jun
2008
15 Jun
'08
4:12 a.m.
* Jon Kibler:
From what I have read, public DNS servers should support both UDP and TCP queries. TCP queries are often used when a UDP query fails, or if the answer is over a certain length.
UDP is used for queries.
TCP is used for zone transfers.
I've seen such claims countless times. 8-( However, you can perform zone file transfers over UFP in some cases (using IXFR), and TCP fallback may happen even if you never respond with packets with the TC bit set.