You may need it in case something doesn't work right with the new firmware. The 3.25 release for the RP114 adds port range forwarding. Go here for partial text version. Go here for partial text version. The firmware worked fine for us, although we did see an occasional frame refresh problem.
New firmware tends to appear there first.
P312 3.20 Go here . P314 3.21 Go here . Naturally, neither company supports the use of the other's firmware on their products. A port forwarding page has been added to the Advanced configuration area of the browser-based configuration menus. Although the internal interface allows PPPoE User Names of 45 characters, the browser interface previously only allowed 30.