Network Monitor

This Q wld be very simple (maybe even absurd..) for all u NT Gurus out there..

I have been asked by my Boss to run netmon against a problem DC as it is rebooting. and trace it going down and coming back up.
How the hell do I do this..
Where do I give the netmon parameters – in the PDC.or to a PC which is in the same physical segment as this problem DC.
By problem DC, I don’t mean it’s not working at all. It’s running pretty fine. but need to investigate an issue with the computer name
any suggestions are welcome..