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DNS problems to RoadRunner - tcp vs udp
- Subject: DNS problems to RoadRunner - tcp vs udp
- From: fw at deneb.enyo.de (Florian Weimer)
- Date: Sun, 15 Jun 2008 10:12:48 +0200
- In-reply-to: <[email protected]> (Jon Kibler's message of "Fri, 13 Jun 2008 14:14:55 -0400")
- References: <[email protected]> <[email protected]>
* 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.