How do you switch from full-duplex to half-duplex

I would like to see if half-duplex would speed up my isp connection. The set up here is cable modem to router to freebsd box.

I want my freebsd box to use half-duplex

thanks in advance for any link or know how.
 
Next command show supported modes for your network card:
Code:
ifconfig -m fxp0
[...]
        supported media:
                media autoselect
                media 100baseTX mediaopt full-duplex
                media 100baseTX
                media 10baseT/UTP mediaopt full-duplex
                media 10baseT/UTP
                media none
                media 100baseTX mediaopt hw-loopback

Change settings with next command:
[cmd=]ifconfig fxp0 media 10baseT/UTP mediaopt full-duplex[/cmd]
 
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