Named requests filling up T1

Simon 'corecode' Schubert corecode at fs.ei.tum.de
Tue Jan 17 05:14:04 PST 2006


Steve Suhre wrote:
> Thanks, I think that's what I was looking for. I expect the "ISP" is in 
> another country somewhere and would be hard to reach, if they could be 
> reached at all. And it's probably a bad reference somewhere to the 
> server here, so shutting of recursive queries could help... If I shut 
> named off for an hour or two they go away, so I'm guessing the offending 
> server switches to the secondary and gets what it's looking for?

In any case you should only allow recursive queries for your trusted 
clients and/or downstream nameservers which forward to you.

Otherwise
a) you produce outgoing traffic when some stranger wants to
b) your dns cache can easily be poisoned because of a)

cheers
   simon

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