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NIC and eth connection


 
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# 1  
Old 08-29-2009
Computer NIC and eth connection

folks;
This might sounds stupid but i hope someone can give me an answer:

On my Linux SUSE boxes, i have 2 NIC cards NIC1 & NIC2. I always assumed that NIC1 is eth0 when i run "ifconfig" and NIC2 is eth1
but i noticed that's not always the case.

Is there a way or a command i can run to find out which NIC assigned to which eth?

Thanks in advance
# 2  
Old 08-29-2009
Invoke ifconfig and write down the two HWaddr strings. These are the MAC addresses for the NICs.

On way is to remove one NIC and check for a label with its MAC address. There is usually a label with the MAC address somewhere on the NIC.

Alternatively if you are connected to a router, you should be able to figure out the MAC address of each NIC from the port it is attached to.

Alternatively install Wireshark, monitor one NIC and drill down into a source packet to determine the MAC address.
 

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