Using Ethtool we can set it as follows.
# ethtool -s eth0 speed 100 duplex full
# ethtool -s eth0 speed 10 duplex half
mii-tool eth0
ethtool eth0
yum install ethtool net-tools
up2date ethtool net-tools
apt-get install ethtool net-tools
Eth0 : Duplex Settings
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