1. Use both the Modem and the router as NAT routers. Do this by making your router a DMZ node on your modem, that way ALL traffic will pass to the router, then set up port forwarding etc on the router.
2. Run the router/modem in bridge mode (recommended). You need to set the modem to run in bridge mode, check the user manual for refrences to bridging. Then set the router to connect to PPPoE using a username and password.
Answers & Comments
1. Use both the Modem and the router as NAT routers. Do this by making your router a DMZ node on your modem, that way ALL traffic will pass to the router, then set up port forwarding etc on the router.
2. Run the router/modem in bridge mode (recommended). You need to set the modem to run in bridge mode, check the user manual for refrences to bridging. Then set the router to connect to PPPoE using a username and password.