full-disclosure - DNS query???

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From: SVerma at ocwen.com (Verma, Sachin)
Subject: DNS query???

Hi,

I have a secondary dns server,which is internal to LAN and on windows 2000
that is generating a lot of queiries for all the 13 root dns servers.The
traffic is blocked by the firewall.But the strange thing that I have noticed
is that the source and destination port being the same i.e 53.Also the
forwarder is correctly set on the DNS server and hence theoritically the
querries need to be forwarded to the next DNS server.

Any body got an idea as to what is this.

S@[|-|i/\/

-----Original Message-----
From: Paul Rolland [mailto:rol@...be.net]
Sent: Tuesday, July 27, 2004 4:11 PM
To: 'Paul Schmehl'; full-disclosure@...ts.netsys.com
Subject: Re: FW: [Full-Disclosure] Question for DNS pros

Hello,

> > The machine sending the queries is probably configured to use
> > your server as a complete DNS resolver and transfer all its queries
> > to your server.
> >
> Umm...I don't *have* a server at that address.  In fact, 
> there is no live 
> host at all at that address.  *That*, after all, is the 
> entire point of 
> this thread.

Understood, but this doesn't prevent someone from making a mistake
when creating its configuration file... and if the resolver has more
than one host (including yours), then failure from your machine will
simply let him skip to next host, which in fact only slows down DNS
resolution. Thus, people are likely to live with a broken configuration
for long...

Collect the source IP(s), find the admin and send him an email...

Regards,
Paul

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