How to Detect Which NIC Interface is cabled/connected?

How to Detect Which NIC Interface is cabled/connected?

Product Line:  VERDE


if you are looking for which eth# has a cable plugged in try:  sudo ethtool eth0 | grep Link

Given the aforementioned, if my eth0 NIC interface is being used, the following will result:


[root@localhost ~]# sudo ethtool eth0 | grep Link
       Link partner advertised link modes:  10baseT/Half 10baseT/Full
       Link partner advertised pause frame use: Symmetric Receive-only
       Link partner advertised auto-negotiation: Yes
       Link detected: yes



NOTE:
The only problem with the above ethtool output is that it will not detect connected cable if your network interface is down. Consider a following example:
# ethtool eth0 | grep Link
       Link detected: yes
# ifconfig eth0 down
# ethtool eth0 | grep Link
       Link detected: no
# ifconfig eth0 up
# ethtool eth0 | grep Link
       Link detected: yes


[8:07]
So, recommend to add ifconfig eth0 up before ethtool

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