You can check the current settings from the shell with the ethtool command. To see what's configured on eth0, you can do this:# ethtool eth0If you need to change either setting, you can use ethtool -s eth0 [ setting | value ]. So to set, say, duplex to full on eth0, you could do this:# ethtool –s eth0 speed 100 duplex full autoneg offIt's important to note that this command doesn't set this permanently, so after a reboot it may revert. To make it permanent, add this line:ETHTOOL_OPTS="speed 100 duplex full autoneg off"in/etc/sysconfig/network-scripts/ifcfg-eth0
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