aau2,
You can do it in two ways;
1)Make a terminal connection to the USB port in the front of the MGU.Use cable TSR 899 135/1, which is a USB to D-Sub cable, plus a 9pin D-Sub female to female adaptor.Use a terminal program, for example, kermit. Baud rate is set to 9600 bits/sec, 8 data bits, no parity, 1 stop bit
2)or use ethernet connection using the default address for eth0 of MGU which is: 192.168.1.2/24 , then do the needed ip changes you want.
rokane