I am used from Linux that setting a network card to 10Mbps full duplex for an optical data link was a problem almost insolvable by mankind. Both finding the documentation and performing the magic trick.
I am impressed by OpenBSD. ifconfig tells me the type of the card - fxp. man fxp and search for "duplex" leads directly to the necessary command. The command is executed without an error message and subsequent ifconfig really shows 10Mbps full duplex. CL<