[CentOS] BIND issues, server not responding
Feizhou
feizhou at graffiti.net
Thu Aug 23 16:37:52 UTC 2007
Paul Heinlein wrote:
> On Thu, 23 Aug 2007, Feizhou wrote:
>
>>
>>> You only need the tcp rule if you plan on serving up zone
>>> transfers, not if plan on only requesting them.
>>>
>>
>> Well, very rare but answers that are over 512 bytes will have to be
>> sent over tcp since the rfc 1035 mandates maximum 512 bytes for the
>> udp payload. So tcp is not just for zone transfers only.
>
> Note that by default Win 2003 uses a packet size of 1280 per Paul
> Vixie's suggestion in RFC 2671 section 4.5.1. I don't know if any other
> OS implementations do the same.
>
> In any event, I've found it helpful to allow up to 1280 bytes of DNS UDP
> traffic. Setting the limit at 512 triggers a noticable number of
> retries, at least in our environment.
>
Sigh. I can see some caching servers with big scissors to apply to udp
packets...if they at all issue queries that get such large replies...
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