Numbering nameservers and resolvers

Doug Barton dougb at dougbarton.us
Tue Aug 17 13:11:51 CDT 2010


On 08/17/2010 05:11, Sven Olaf Kamphuis wrote:
> tcp/zonetransfer not working reliably is no longer a problem

TCP is a MUST for DNS.

It's used as a fallback in the normal resolution process if an answer 
can't fit in a UDP packet for whatever reason. This is true even for 
common things like large A record lists, but is only becoming more 
frequent in the age of DNSSEC, AAAA, etc. It is unfortunately even more 
necessary than we had hoped it would be due to many local network 
operators not "getting the memo" regarding EDNS.


hth,

Doug

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