nanog mailing list archives

Re: sniffer/promisc detector


From: Donovan Hill <lists () lazyeyez net>
Date: Sat, 17 Jan 2004 11:33:02 -0800


On Saturday 17 January 2004 11:18 am, Scott McGrath wrote:
It is also possible to sniff a network using only the RX pair so most of
the tools to detect cards in P mode will fail.  The new Cisco 6548's have
TDR functionality so you could detect unauthorized connections by their
physical characteristics.

But there are also tools like ettercap which exploit weaknesses within
switched networks.  See http://ettercap.sourceforge.net/ for more details
(and gain some add'l grey hairs in the process).

The question here is what are you trying to defend against?.



Maybe this is just a stupid comment, but if the original poster is that 
concerned with their LAN being sniffed, then maybe they should consider using 
IPSec on their LAN.

-- 
Donovan Hill
Electronics Engineering Technologist, CCNA
www.lazyeyez.net, www.gwsn.com



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