From: Robert M. Rhode
Subject: Updates killing DHCP, BOOTP, etc.
After updating to Mac OS X 10.2.8 on my 500 Mhz powerbook, I ran into the same problem that occured when I update(d) using using Airport 3.1.1 several weeks ago It appears to be identical to the problem that so many are having right now. The network connection is lost because DHCP option is missing from the network preference pane as is BOOTP and other tabs. Nothing shows up in the Network Overview portion of the Sytem Profiler other than flag and ethernet address (previous times it may have been completely blank).
In my case: rolling back to an older AppleGMACEthernet.kext version does not work, nor does removing the /var/db/NetworkInterfaces.xml, /var/db/SystemConfiguration/preferences.xml, & /var/db/SystemConfiguration/com.apple.airport.preferences.xml
What does work for me but I have absolutely no idea why (any suggestions?) was what recommended somewhere a while ago (however, I can't now find it!!) for this problem which has cropped up repeatedly and over several software updates is to remove:
/System/Library/SystemConfiguration/Apple80211Monitor.bundle
and reboot.
Again I don't know what I'm doing (!), but it works and I haven't noticed any bad side effects. Would some expert please chime in and tell us what's going on?
I hope this helps, be careful, be sure to back-up, your mileage may vary, good luck....
