I have a computer with 2 NICS that are bridged and I need a means of distinguishing between machines connected to eth0 from machines connected to eth1.
I was hoping to use something like the "arp -a" command. However, when the NICS are bridged, the arp table is always empty. I believe this is correct since section 2.1.1. Overview of Address Resolution Protocol [http://linux-ip.net/html/ether-arp.html], mentions that "Since networking hardware such as switches, hubs, and bridges operate on Ethernet frames, they are unaware of the higher layer data carried by these frames".
Is anyone aware of other tools that I could use which will maintain an arp table on a particular NIC even when the NIC has been bridged?