You can now enable full duplex ethernet in Jaguar. Previously, the ifconfig command would not recognise the mediaopt full-duplex flag, even though ifconfig listed it as an option. It seems to be fixed now in Jaguar, but I have not yet done any speed tests to confirm whether it really is working. Anyways the error message is gone when you try to enable full-duplex. These commands should be entered in the terminal window:
To view the current ethernet settings:
% ifconfigTo change to full duplex:
% sudo ifconfig en0 mediaopt full-duplexTo change back to half duplex:
% sudo ifconfig en0 mediaopt half-duplexTo force a different speed (your network/hub/router/modem must also support this speed!):
% sudo ifconfig en0 media 10baseT/UTP mediaopt full-duplex [or]Check the output of 'ifconfig' to see the supported media types for your ethernet card.
% sudo ifconfig en0 media 100baseTX mediaopt full-duplex [etc...]
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http://hints.macworld.com/article.php?story=20020902082941913