Wired ethernet issues

I'm having problems with wired ethernet on my MacBook Pro. I connect my MBPro up to another machine using a non-crossover cable and it works fine. I disconnect it and hook it up again after a while and it no longer works. I do an ifconfig and see that en0 is inactive. It only works again after I reboot the MBPro.
Does anybody know how to fix this?
Evan
P.S. I also have wireless ethernet running while doing this. But, I doubt that that makes much of a difference.

There seems to be a number of issues here all centered about the built-in ethernet port. I have had a similar problem with 2 different MBP's. After working with Apple tech support we found it to be a software problem, not a hardware problem.
This fix may not be applicable to all of the different iterations of ethernet problems listed here, but here is what I did. I moved the file /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist. to my desktop. I restarted my computer and the port worked without a problem. If this doesn't seem to fix the problem, you could move the file back to it's original location, or I think you could delete it without a problem.
HTH,
Drew

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