Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

This question already has an answer here:

I'm new to linux and I have server with four network cards. I have to identify which physical network interface is assigned to the names eth0, eth1, eth2 and eth3. I have to disconnect cable from eth2 and do not know which network card it is.

Thanks

share|improve this question

marked as duplicate by Iain, Dave M, mdpc, dawud, Falcon Momot Sep 29 '13 at 20:02

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

add comment

2 Answers

up vote 23 down vote accepted

You can use ethtool.

ethtool -p ethX [N]
  • ethX – network interface name
  • [N] – number of second to blink

Example:

ethtool -p eth2 15

This will blink the network interface eth2 for 15 seconds, then you can see which physical network interface is for eth2

share|improve this answer
add comment

to check the Physical link in linux, use miitool.

It shows if your network card is connected or not.

share|improve this answer
    
This will tell you if anything is connected, and the utility can help control the interface, but it is of very little help in differentiating them. A particular feature of ethtool which allows manual control of the LEDs is sometimes helpful. –  Falcon Momot Sep 28 '13 at 7:28
add comment

Not the answer you're looking for? Browse other questions tagged or ask your own question.