RE: switch jamming

From: Anthony Gruppuso (
Date: 01/31/02

From: Anthony Gruppuso <>
Date: Thu, 31 Jan 2002 09:36:44 -0500

Does anybody know of any switches that can protect against this type of
attack, or is virtually every switch affected? I imagine this is "old
news," so what have vendors done to counteract this type of activity?

-----Original Message-----
From: Sebastian Jaenicke []
Sent: Wednesday, January 30, 2002 5:13 PM
Subject: Re: switch jamming


On Wed, Jan 30, 2002 at 10:05:08PM +0000, Jan wrote:
> how can i sniff upon a switched network segment ? a read some articles
about "switch jamming" and "port mirroring" but up to know i didn't
learn anything special at all.
> ca some of your guys out there help me ? (i'm sure some of you can but
are you willing, too ?)

This can be achieved by flooding the switch with spoofed ARP packets
its internal MAC table is filled up - most switches will then revert to
"hub mode" and therefore broadcast all traffic to the network where it
can easily be sniffed. should
give you some (more accurate?) information.


Sebastian Jaenicke
whois|perl -ne's-^certif: +--&&print'
  "Object-oriented programming is an exceptionally bad idea which
   could only have originated in California." --Edsger Dijkstra  

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