How To Change network card from Half to Full duplex in Linux

Use following method to change a network card from Half to Full duplex.

This is performed with the mii-tool.

# mii-tool --force=100baseTx-HD eth1 (half duplex 100 base T)
# mii-tool --force=100baseTx-FD eth1 (Full duplex 100 base T)
# mii-tool --force=10baseT-FD eth1 (Full duplex 10 base T)
# mii-tool --force=10baseT-HD (Half duplex 10 base T)

I hope it helps :)