DNS problems to RoadRunner - tcp vs udp
fw at deneb.enyo.de
Sun Jun 15 03:12:48 CDT 2008
* 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
More information about the NANOG