Check speed and duplex of an Ethernet card with Redhat

Friday, February 22nd, 2013

How does one check the speed and duplex on a computer running Redhat?

A simple tool (if installed) called ethtool will give such information.

You will have to use a root to get this information.

# ethtool eth0
Settings for eth0:
Supported ports: [ TP ]
Supported link modes:   10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes:  10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: g
Wake-on: g
Link detected: yes

ethtool can also make changes but I have not had a need to do that yet.

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