> I try to set my ep0/3Com509B to full duplex mode. ifconfig replies:
>
>   distel# ifconfig ep0 mediaopt full_duplex
>   ifconfig: unknown Ethernet media option: full_duplex
>
> Could it be, that full-duplex is not implemented in the driver? A
> document on the 3Com website says, that the 3C509B can do full duplex.
>
you must use DOS 3c5x9cfg.exe program to set it up i think.

(and never managed to negotiate it well with my switch)