notsosuresignal.com

Requires the following “port range triggering” (under “Applications and Gaming”) to be set up:

50, 4500, 500, 8 and 123

Put each one in its own row in the table, and put the same number under Triggered Range Start Port, and End Port and Forwarded Range Start Port and End Port.
Don’t forget to Enable each one (see below).

Port forwarding wouldn’t work, as the router needs to be told what (local) address to forward to, but there is no way with this router to get it to assign a fixed IP address to a particular node, nor, it seems, to have the femtocell take a static IP address. But Port Range Triggering does the trick!

Linksys WAG325N Sure Signal Configuration Settings