youll need to connect a DB9 male connector to the com port of the unit and then connect at 9600,8,1,n via hyper terminal.
Once you are at a prompt type nbxIpConfig and press enter. From here youll be prompmted to change the address. be sure and mind the format. once you have the address changed you can do a ctrl+r from the console to do a soft reboot.
Keep in mind every 10th reboot on this box will cause it to go into a disk check which takes up to an hour on systems that have more than 30-40 users. The most common mistake people make is unplugging the system and plugging it back in while its doing a disk check. I bet you wont guess what this causes the system to do? You guessed it, another disk check. stay aware of this.