sniffer/promisc detector

Fri Jan 16 23:18:37 UTC 2004

That is a battle that was lost at its beginning: the Ethernet 802.1d
paradigm of "don't know where to send the packet, send it to all ports,
forget where to send packets every minute" is the weak point.
There are some common mistakes that sniffing kits do, that can be used to
detect them (I think antisniff implements them all), but a better approach
is to make to promisc mode of no gain unless the attacker compromises the
switch also. In Cisco-world, the solution is called Private VLANs.
Nortel/Bay used to have ports that could belong to more than one VLAN,
probably every other swith vendor has its own non-IEEE 802 compliant way of
making a switched network more
secure.

Rubens

----- Original Message ----- 
From: "Gerald" <gcoon at inch.com>
To: <nanog at merit.edu>
Sent: Friday, January 16, 2004 8:35 PM
Subject: sniffer/promisc detector

>
> Subject says it all. Someone asked the other day here for sniffers. Any
> progress or suggestions for programs that detect cards in promisc mode or
> sniffing traffic?
>
> Gerald
>