maybe a dumb idea on how to fix the dns problems i don't know....

Chris Paul chris.paul at rexconsulting.net
Sun Aug 10 16:52:58 CDT 2008


list-nanog at pwns.ms wrote:
>> (I know; you old folks that created this wonderful thing didn't think of 
>> that back then.... blah blah blah).
>>     
>
> If they had thought of it back then, they would have allowed for a larger TXID, not used TCP. TCP connection setup time is slow; TCP DNS is much slower than UDP DNS.
Good point.

But we only care about TCP connection setup time in *interactive* 
sessions (a human using something like the web). If you have a 
persistent connection to your dns server from your dns resolver on your 
browser machine, you just send the  request.... no TCP setup there at 
all. You can even pool connections. We do this stuff in LDAP all the time.

How does TCP resolution work in most resolver libraries? A TCP 
connection for each lookup? That is kind of dumb isn't it, speaking of 
dumb.... I actually don't know. Not much of a coder, so I'll let you 
coders check your code and get back to me on that...

well.. maybe i'll fire up snort or wireshark and check it out later with 
some different dns libs....

CP
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Chris Paul
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