Originally posted here by Penguin
but how can u know the MAC addr by seeing e picture? and how u can see the NIC is a 3COM brand thru the picture?
See how it lists the column as source?

See the AAAAAA65AA.xxxxxxxxxxxx ? That xxxxxxxxxxxx is the MAC address. It gave you the MAC probably because it was either an etherframe (or some other non-IP protocol) on the local network. Then you can go to one of numerous websites that will look up the manufacturer of the NIC based on the first 3 octets of the MAC.

/nebulus