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Re: How to find MAC address
From: Andreas Ericsson <ae () op5 se>
Date: Fri, 31 Mar 2006 11:15:48 +0200

Martin O'Neal wrote:
What you are asking for is not possible with Ethernet networking.

When

your IP packets have to cross a network boundary by way of a router

the

real destination MAC address is masked by the router.


Not at the IP level, but the MAC is available through querying higher
level protocols.


Yes. Fortunately though, nmap doesn't handle Cisco's (or any other 
vendors, for that matter) proprietary protocols. Since the question 
regarded nmap use, the answer is still valid (except that it masks the 
*source* MAC address. The destination MAC is determined by the switch, 
or not at all if a hub is used).

-- 
Andreas Ericsson                   andreas.ericsson () op5 se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231


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