about tcp port 53

[Breno Silveira Soares]

Tech W. escreveu:
> --- On Tue, 28/7/09, Stephane Bortzmeyer <bortzmeyer at nic.fr> wrote:
>   
>>> what's the use of bind's tcp port 53?
>>>       
>> DNS requests and responses.
>>
>>     
>
> oh, I was always thinking dns requests and responses are going with udp protocal. under what condition it uses tcp protocal?
>   
Try this: "dig @a.dns.br br dnskey +dnssec +bufsize=1000"
And you'll see a message: ";; Truncated, retrying in TCP mode."
Dig retry the query with TCP because the server a.dns.br return with TC 
(Truncated) bit set.


-- 
Ats,
Breno S. Soares
Analista de Redes
SERPRO/SUPRE/REBHE
Tel: (31) 3311-6825



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