tracking source of dns queries

[Mikael]

Hello,

I've posted earlier about a problem with recursive-clients. I got this sort
of logs :

Jun 14 09:23:30 hostname named[1045]: client: client 127.0.0.1#34559: no 
more recursive clients: quota reached

After doubling the "recursive-clients" option to 2000, I got this problem
again. It is really worrying because the dns server seems to stop accepting
requests and thus making the whole system unreachable, which is not really
appreciated as it's a mail server :(

Not knowing why this happens, I wonder if there's a way to track which
process sends dns queries on this host (many requests come from the host
itself).

Any idea ?

-- 
Mikael