RE: OT: Tool to identify Evaluate DNS clients?
- From: "William Robertson" <robertson.william@xxxxxxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 18 Aug 2004 07:44:20 +0200
Hi Jason
That's exactly what I think the problem is, but with 1300 workstations it's
tricky to track the culprit down (let's not get into a discussion over why
my AV won't fix it... within the next 3 months I will have it replaced -
woohoo!!)
-----Original Message-----
From: Jason Merrique [mailto:j.merrique@xxxxxxxxxxxxxxx]
Sent: 17 August 2004 04:08 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: OT: Tool to identify Evaluate DNS clients?
http://www.ISAserver.org
If one of your desktops is generating a lot of DNS requests, it might be
infected with a mass mailer worm. These need to do a DNS lookup for
every bit of spam they're sending out. Worth a look.
Jason
> -----Original Message-----
> From: William Robertson [mailto:robertson.william@xxxxxxxxxxxxxx]
> Sent: 17 August 2004 14:36
> 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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opinions are those of the sender unless clearly stated as being that
of Columbus Stainless. The person addressed in the e-mail is the sole
authorised recipient. Please notify the sender immediately if it has
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