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 19:21:46 CDT 2008


Joe Greco wrote:
>> 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....
>>     
>
> Pretending for a moment that it was even possible to make such large 
> scale changes and get them pushed into a large enough number of clients 
> to matter, you're talking about meltdown at the recurser level, because
> it isn't just one connection per _computer_, but one connection per
> _resolver stub_ per _computer_ (which, on a UNIX machine, would tend to
> gravitate towards one connection per process), and this just turns into 
> an insane number of sockets you have to manage.
>   
Couldn't the resolver libraries be changed to not use multiple connections?

CP

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Chris Paul
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