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RE: Caching a sniffer
From: "Shawn Jackson" <sjackson () horizonusa com>
Date: Thu, 25 Mar 2004 09:01:41 -0800

Agreed, switches can be made to give up secrets, however, as I have sub
sequentially 
pointed out if ARP/CAM table poisoning is used switches will report
moving mac address 
problems to their management tools and hence you will be able to
determine where the 
sniffer is plugged.

Using Cisco's management and analysis suite that I know. But in my case
here we have a
large rail-frame HP Procurve switch, very nice unit but none of the
functionality you
mentioned. Same with other vendors like SMC, Dell, etc.

A simple syslog monitoring tool will give you this information.

Know of any off the top-of-your-head? I currently have a syslog server
setup, but 
I usually have to make my own shell scripts to get the information I
need. 

Any medium to large organization should be using manageable network
devices 
(rather than the cheap un-managed small type) and all of these (to my
knowledge) 
support at least syslog free out of the box. A simple Linux server will
then collect 
any data, and every company has an old PC they can acquire for this
purpose.

Well, I hope anyone other then SOHO would not be using Netgear, Linksys,
etc in their
network, that has to get against some kind of standard somewhere. But
companies like
SMC (TigerSwitch Platform) are Small-Med biz placed, manageable, gear.
Now that might
have changed that they do support remote syslogging but last time I
looked at their
line, it was absent.

The setting up of a Linux box requires some clue, but I would think it
would be 
in the realm of any sysmin. Some call me a dreamer, maybe they're right
:-). This has
been a good topic, I hope other members of the list were able to learn
something.

Shawn Jackson
Systems Administrator
Horizon USA
1190 Trademark Dr #107
Reno NV 89521

www.horizonusa.com
Email: sjackson () horizonusa com
Phone: (775) 858-2338
       (800) 325-1199 x338

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