DNS problems to RoadRunner - tcp vs udp
fw at deneb.enyo.de
Sun Jun 15 08:12:48 UTC 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
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