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Linux - Networking This forum is for any issue related to networks or networking.
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Old 07-27-2004, 03:50 AM   #1
Registered: Jul 2004
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How to specify which eth# maps to to which nic.


Iam having 3 NIC cards in 3 slots in my system. i would like to know eth# that is assigned to each card.

Is there is any system call /configuration file for getting the same or any other means?.

Thanks & Regards

Old 07-27-2004, 04:17 AM   #2
Registered: Dec 2002
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Distribution: Fedora Core 4
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the output of

$ ifconfig

will show all the NIC's on the system and their associated hardware address, which is unique for every NIC. That HW address should be visible on the card and / or retrievable via utility programs.
Old 07-27-2004, 04:30 AM   #3
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normally if module for a specific card is loaded before others.
that interface becomes eth0 and vice versa.

check through

dmesg |eth
Old 07-27-2004, 04:30 AM   #4
Registered: Jul 2004
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Thank U for your information
but, i would like to know which NIC is given which eth#;
even if we go for 'ifconfig' it gives H/W address.
But how to resolve that this is the address of this particular NIC card if both carda are from same manufacturer.

Waiting for ur reply


Old 07-27-2004, 04:36 AM   #5
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Even with 'dmesg | grep eth' we will get the driver name associated with eth#.
but, when we are having NICs from same manfacturer its difficult to trace the

Waiting for ur Reply

Old 07-27-2004, 07:01 AM   #6
Registered: Aug 2002
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AFAIK the NICs will be assigned as scanned on the bus starting with PCI slot 1. The first NIC found will be eth0, the next eth1 etc. The onboard NIC, if any will be last.

If I remember slot 1 is the one closest to the AGP slot. Check your motherboard manual.

You can test each interface by turning the others off. i.e.
ifdown eth0


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