said by Bytebender :

It is possible - but the unfortunate thing about the actiontec is that it does not have a true bridge mode.
To use a router behind the actiontec - first change the actiontec's IP from 192.168.1.1 to 192.168.99.1, then disable the DHCP server, (which will also disable the actiontec's wireless functions). Then connect your Linksys.
This is something the ISP tech support should be able to walk you through.
Alternatively - disable the Actiontec's wireless functions, then connect the Linksys, and change the Linksys' private IP range to something other than 192.168.1.x - like 192.168.100.X or 10.10.1.X - and all should be well.

said by Bytebender :

The techs won't help with changing the IP in any other modem/router, that's true, but the above procedure is their only "ISP supported" method of "bridging" the Actiontec units. It's the way they have to do it, only with the Actiontec units.

Disabling the Actiontec's wireless functions and changing the private IP range of the Linksys is what should be done.

Although the ideal setup would be to obtain a simple ADSL2 compatible "bridge modem", or "dumb modem", (one with no internal router at all), and let the Linksys take care of the ISP connection. If you buy a "Cable/DSL" type dumb modem, you should be able to use your setup with almost any future ISP

said by sozekizer :

techs actually do help w/ the IP Address change in the Actiontec. In fact, it is the only modem/router which Verizon requires this support for if asked. In fact, instructions are provided to the techs on exactly how to do this. Your suggestion of an ideal setup is less than ideal since Verizon will not and cannot provide support for a non-Verizon provided modem. Bridging the Actiontec is the easiest way to do what you want to do.