Ports

[Genco YILMAZ]

Hi Stephane,
thanks for your helpful information but I wonder something.
Most resolvers prefer using UDP as their transport layer protocol right ?
Do you know which resolvers use TCP for queries ?
or How can we know that our resolver use tcp or udp ?




Stephane Bortzmeyer wrote:

>On Tue, Jan 27, 2004 at 09:53:19PM +0100,
> Remko Lodder <remko at elvandar.org> wrote 
> a message of 50 lines which said:
>
>  
>
>>TCP 53 is used for very large queries and transfering zones.
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>                     ^^^^
>
>1) This is wrong: a resolver can use only TCP if it wishes.
>
>2) What is your definition of "very"? A TLD like '.ro' (Romania) or
>'.hk' (Hong-Kong) cannot even transfer its complete set of NS (I do
>not mention the additional section, with the IP addresses) if the
>query is at the maximum allowed size.
>
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>>I only open up port 53 on TCP level for zone transfers,
>>    
>>
>
>You are wrong.
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>