RE: OT: Tool to identify Evaluate DNS clients?

Thanks Tom, unfortunately I don't have Exchange, I've only got a Linux
SendMail server - with very limited options regarding the control of mail
etc.

You got a good point though - I do believe the problem is a symptom of bogus
addresses being queried against my DNS server and then just causing an
inherent DoS. The problem is trying to find the culprit that is causing this
problem... I'll try again and look into the Packet Sniff's, was just hoping
that someone out there may have heard of some reporting utility that could
assist with aggregating the DNS logs or something.

Anyway, thanks again,
Cheers
William R.

-----Original Message-----
From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx] 
Sent: 17 August 2004 04:36 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: OT: Tool to identify Evaluate DNS clients?

http://www.ISAserver.org

Hi William,

Could be something that I saw not too long ago on my own corpnet. Is
your Exchange Server getting flooded with bogus destination e-mail
addresses? The NDR and notification messages might be trying to resolve
bogus domain names. Turn off NDR and notification messages and it will
stop. Check your queues and badmail folders to confirm.

HTH,

Tom
www.isaserver.org/shinder
Get the book!
Tom and Deb Shinder's Configuring ISA Server 2004
http://tinyurl.com/3xqb7
MVP -- ISA Firewalls



-----Original Message-----
From: William Robertson [mailto:robertson.william@xxxxxxxxxxxxxx] 
Sent: Tuesday, August 17, 2004 8:36 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: OT: Tool to identify Evaluate DNS clients?


http://www.ISAserver.org

Hmmm, tried to avoid saying that... what I am seeing is that my internet
link is saturated with outbound DNS requests. In my Firewall Logs I can
only
see my 2 DNS servers as doing the requests for outbound DNS queries,
which
is the way it is meant to be...

But what I am presuming is that some client workstation is
generating/causing a helluva lot of DNS requests, either via directly
contacting my DNS Server, or by requesting Port 80 traffic which will
then
route via my Firewall to my DNS Server, and then back through my
firewall.

So I was hoping to tackle the easier scenario first, and hoping to
generate
some sort of realtime/historical report which will show me the "Top
Requesters" for DNS resolution against my DNS Servers...

Is there something like this?

-----Original Message-----
From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx] 
Sent: 17 August 2004 03:24 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: OT: Tool to identify Evaluate DNS clients?

http://www.ISAserver.org

Hi William,

Are you saying that the ISA firewall is generating a lot of DNS traffic?

Thanks!

Tom
www.isaserver.org/shinder
Get the book!
Tom and Deb Shinder's Configuring ISA Server 2004
http://tinyurl.com/3xqb7
MVP -- ISA Firewalls



-----Original Message-----
From: William Robertson [mailto:robertson.william@xxxxxxxxxxxxxx] 
Sent: Tuesday, August 17, 2004 6:11 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] OT: Tool to identify Evaluate DNS clients?


http://www.ISAserver.org

Hi there

I seem to be experiencing an extreme amount of outbound DNS requests via
my
FIREWALL to my local DNS Servers. I am quite confident that this traffic
is
not legitimate and is most likely the source of an *evil* application ;)

Does anyone know if it is at all possible to "query" a Win2K DNS Server
to
see which clients are in fact making the DNS requests? I.e. I want to be
able to see which PC is at the top of the list with regards the number
of
queries, or at least see which "dodgy" domain names are being requested
from
which PC's...

Any ideas?
Thanks
William R.

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