full-disclosure - info on ip spoofing please

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Message-ID: <443C0973.4090702@csuohio.edu>
Date: Tue Apr 11 20:56:03 2006
From: michael.holstein at csuohio.edu (Michael Holstein)
Subject: info on ip spoofing please

> My question is How can you sniff packets on a link that your machine is 
> NOT on ie NOT on the same subnet??

It's not the subnet that's important .. it's the broadcast network 
(usually a VLAN). ARP spoofing is the standard way of doing this, but 
ARP isn't (usually) forwarded across a router.

You can't (passively anyway) sniff packets from a host in another VLAN 
without some special trickery.

/mike.