Re: Sniffing on a switch

[Dave Bush <hockeystatman () gmail com>]

On 10/27/05, Andy Meyers <andy.meyers () hushmail com> wrote:
> Now i know people say you "cant" sniff on a switch and I know about ARP
> poisoning and MAC flooding. But there has to be another way. I have heard
> too many stories about "he sniffed my AIM conversation on a Cisco switch"
> (an example is in the most recent version of 2600). Does anyone know of any
> technique how to do this? Can you ARP poison a switch?

I've heard of the techniques used by DSNIFF, but have never tried it.

If you've got admin privs on a switch (either authorized or
unauthorized) you can span a port so that two get the same traffic.

ie: Make port 7/23 (your port) the same as port 7/9 (the port you want
to sniff).

Have done this to monitor systems before. Works like a charm!
--
Dave Bush <hockeystatman () gmail com>

There are two seasons in my world - Hockey and Construction

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