DNS problems to RoadRunner - tcp vs udp
sethm at rollernet.us
Fri Jun 13 13:24:27 CDT 2008
Jon Kibler wrote:
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> Mark Price wrote:
>> >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.
> If my server responded to TCP queries from anyone other than a secondary
> server, I would be VERY concerned.
I see long TXT records from some DNSBLs that won't fit in a UDP packet
on a daily basis. Certainly nothing to be concerned about.
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