you want the ip shown in ipconfig which when behind a router is the internal ip. Not the mac address, when you do packetcollector -d you will get something like this:
1.\Device\NPF_GenericNdisWanAdapter (Generic NdisWan adapter)
2.\Device\NPF_{5D04AF52-9333-43B5-BB01-6E42FB17A30C} (3Com Gigabit NIC (3C2000 F
amily) (Microsoft's Packet Scheduler) )
3.\Device\NPF_{268806E1-FF57-48F7-81F2-01BFD0B4104C} (NET IP/1394 Miniport)
4.\Device\NPF_{222816DA-2E60-4B54-B601-6EF1195D2C67} (NET IP/1394 Miniport)
my ethernet card is #2 so id use 2
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