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Re: Caching a sniffer
From: "aruna" <arunah () slt lk>
Date: Sat, 27 Mar 2004 11:00:02 +0600

Hi,

Appreciate to know the tools / methods available to sniff packets in a
switched environment.
The issue is that there is NO span port , how could this being done.

aruna
----- Original Message -----
From: "Nero, Nick" <Nick.Nero () disney com>
To: <gillettdavid () fhda edu>; "Andrew Shore" <andrew.shore () holistecs com>
Cc: <security-basics () securityfocus com>
Sent: Friday, March 26, 2004 2:47 AM
Subject: RE: Caching a sniffer


Great article covering about everything you can do on Layer2 . ..

http://www.cisco.com/en/US/netsol/ns340/ns394/ns171/ns128/networking_sol
utions_white_paper09186a008014870f.shtml

-----Original Message-----
From: David Gillett [mailto:gillettdavid () fhda edu]
Sent: Thursday, March 25, 2004 11:21 AM
To: 'Andrew Shore'
Cc: security-basics () securityfocus com
Subject: RE: Caching a sniffer

A switch is not a hub/router. In fact it is a micro segmented bridge.

A switch operates at layer 2 of the OSI model ie MAC address layer.

  Amen, brother.

Therefore if someone has plugged a scanner into a network point they
will not be able to sniff any useful information from the network
unless that person has admin access to the switch. You can check this
by ensuring that none of the ports on the switches are in span mode

  While you need admin access to set up a span port, Shawn and I have
alluded to two different techniques which can allow non-admin users to
sniff traffic on a switched network.  It's true that neither of these is
quite "normal behaviour" -- they involve using special tools to modify
the behaviour of hosts or switches.  But the tools exist and are readily
available, and so the issue that confronts admins is how to detect
and/or frustrate their use.

David Gillett




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any course! All of our class sizes are guaranteed to be 10 students or less 
to facilitate one-on-one interaction with one of our expert instructors. 
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of an Ethical Hacker to better assess the security of your organization. 
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