We have had a pissing match lately and here's the details. One person states
that a VLan can not be sniffed because it is on a different subnet. The
other person says it can becuase it's physically on the same switch. I think
you can to a point. Here's what I mean; let's say we have a 3524 with two
Vlans, VLAN1 (we'll call it InfoSys), and VLAN2 (called HR). If I have a
sniffer running on InfoSys, I should be able to sniff traffic on my subnet
as well as traffic from HR to InfoSys (ie HR employee accessing mail server
on InfoSys), right? The only difference is that the source MAC address would
change. I should not be able to sniff traffic local to HR (ie an employee
accessing accounting software) right? What's the rub?
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