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Chapter 10. Adjusting Network Settings
10.1. Changing Network Adapter Settings
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To check the speed and settings of network adapters, use the
ethtool command which works now for most network interface cards. To check the adapter settings of eth0 run:
ethtool eth0
# ethtool eth0
To force a speed change to 1000Mbps, full duplex mode, run:
ethtool -s eth0 speed 1000 duplex full autoneg off
# ethtool -s eth0 speed 1000 duplex full autoneg off
To make a speed change permanent for
eth0, set or add the ETHTOOL_OPT environment variable in /etc/sysconfig/network-scripts/ifcfg-eth0:
ETHTOOL_OPTS="speed 1000 duplex full autoneg off"
ETHTOOL_OPTS="speed 1000 duplex full autoneg off"
This environment variable is sourced in by the network scripts each time the network service is started.
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