How to change speed and duplex settings Ethernet
mii-tool or ethtool package which allows modify/change and view the negotiated speed of network interface card
Install mii-tool and ethtool tools
# yum install ethtool net-tools
Get speed and other information for eth0
Type following command as root user:
# ethtool eth0
Or use mii-tool command as follows:
# mii-tool eth0
Change the speed and duplex settings
Setup eth0 negotiated speed with mii-tool
Disable autonegotiation, and force the MII to either 100baseTx-FD, 100baseTx-HD, 10baseT-FD, or 10baseT-HD:
# mii-tool -F 100baseTx-HD
# mii-tool -F 10baseT-HD
Setup eth0 negotiated speed with ethtool
# ethtool -s eth0 speed 100 duplex full
# ethtool -s eth0 speed 10 duplex half
Add following lines to /etc/rc.local for work persistant
ethtool -s eth0 speed 100 duplex full autoneg on 1>/dev/null 2>/dev/null
ethtool -s eth1 speed 100 duplex full autoneg on 1>/dev/null 2>/dev/null
Category: Linux Administration
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