Anritsu FAQs
How do I get my MS2721B to use a manual ethernet address after I enter one?
After you enter the ethernet address you want to use (i.e. 10.0.0.2) you must restart the unit on a live ethernet connection. You can use the crossover cable to connect to your computer's ethernet port as a live port, but only if you are assigning an address. If you use the DHCP (dynamic host control protocol), you must hook to a live ethernet connection that allows for DHCP requests.
