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RE: Caching a sniffer
From: "David Gillett" <gillettdavid () fhda edu>
Date: Thu, 25 Mar 2004 08:06:09 -0800



-----Original Message-----
From: Fernando Gont [mailto:fernando () gont com ar]
Sent: Wednesday, March 24, 2004 2:27 PM
To: gillettdavid () fhda edu; security-basics () securityfocus com
Subject: RE: Caching a sniffer


At 08:58 24/03/2004 -0800, David Gillett wrote:

  I presume that some switches, faced with something like 
macoff, will
overflow the table such that legitimate addresses that 
should have been
learned start flooding to all ports as well.
  But this is not the only possible reaction of a switched 
network to
macoff!  If Cisco's port security is enabled, the switch may 
just shut
down the port running macoff.

How does it detect this? By realizing that frames from a 
given port come 
from several different MAC source addresses?

  Exactly.  The configurable parameters for port security are:

1.  Maximum number of different source MAC addresses to be seen
    from this port.

2.  Action to be taken (alert, or shutdown port) when this limit
    is exceeded.

David Gillett



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