> >> The main function of a switch is to keep irrelevant > packets away from > > >> hosts, but packets to unknown (to the switch) hosts get sent > >> everywhere, just like a Hub would do. > >> > > > >yes - thanks all, it appears its a cross network 'issue' > > > >thanks > > If you're trying to get a MAC address across your own switches, you > could try walking the switch's forwarding table (assuming SNMP > availability). It's a cheesy way but works! If you have CDP enabled switches, try one of the magic auto discovery programs out there. I use NetDisco (netdisco.org), but there is also nTop and a ton of commercial apps. CDP is cisco, but all the major vendors have a similar protocol. NetDisco has a web interface listing what macs/vlans showed up on what ports, duplex mismatches, and all your switch os/patch levels. Patrick