10.4.3 Causes ethernet port to stop functioning after a while

Every since updating to 10.4.3, it seems that my PM G5 has to be restarted in order to connect back to my router.
Apparently my situation is similar to http://discussions.apple.com/click.jspa?searchID=-1&messageID=726998 . The solution suggested there was to unload and reload the kext.
How do I do this ? I found and article from macoshints : http://www.macosxhints.com/comment.php?mode=display&sid=20030409222351429&title= Aneasierway&pid=20980 Which kext do I unmount for the etherenet one? Thanks!
PM Dual 2.7GHZ Mac OS X (10.4.3)

How similar ?
Same specific log problem ?
UniNEnet::restartTransmitter - transmitter appeared to be hung.
Try bringing the interface up and down first(ina terminal):
sudo ifconfig en0 down
sudo ifconfig eno up
As for how to unload a kernel extension (kext), you use kextunload.
man kextunload for more information.
I don't recall how I ended up suggesting that - but it no dooubt had something to do with googling for that error in the logs...

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10.4.3 Causes ethernet port to stop functioning after a while

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