For those of us with Network issues with 10.2.8. The fix is here. Basically you need to put the old AppleGMACEthernet.kext from 10.2.6 in the System/Library/Extensions folder. There is a link to the old file in the link provided.
GG Apple
http://discussions.info.apple.com/webx?14@@.5999d9d9/10
The AppleGMACEthernet.kext driver in /System/Library/Extensions has been updated from 1.2.4 to 1.3.0. The 1.3.0 version apparently breaks the onboard ethernet somehow. I found someone who had not yet installed the update, and copied their kext to a CD. To install it, back up your existing kext to your home directory, and then go to the terminal:
cd /System/Library/Extensions
sudo rm -Rf AppleGMACEthernet.tar.gz
sudo cp -r /path/to/AppleGMACEthernet.tar.gz .
cd ..
sudo rm Extensions.kextcache
sudo rm Extensions.mkext
Now reboot. The last two lines clear out the cache of Extensions. I don't know if they're strictly necessary. I posted the old kext at
http://web.mit.edu/apm/www/AppleGMACEthernet.tar.gz
I take absolutely no responsibility for this fix. Your mileage may vary. Please don't blame me if you hose your system doing this. Hope this helps.
Andrew
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