Forwarding Ports from Modem to Router

I have an "Efficient Speedstream 5667 DSL modem" with a built in firewall, connected to a "LinksysBEFSR41 V2 router", which also has a firewall. How do I forward a port through both firewalls?

Here is what I've tried so far with the the help of Folken: (http://forumz.tomshardware.com/network/modules.php?name...)

The modem is plugged into the routers WAN port;

At the linksys router's web interface, I set it from "Obtain an IP Address Automatically" to "Specify an IP Address"

There are four fields;

LINKSYS ROUTER

SPECIFIED IP ADDRESS: 192.168.0.1 (the lan ip for the router is 192.168.1.1. I just made 192.168.0.1 not really knowing if that is ok)
SUBNET MASK: 255.255.255.0
DEFAULT GATEWAY: 192.168.254.254 (the modem's lan ip)
DNS: xxx.xxx.xxx.x (this is the name server my isp gave me)


Ok, then I went to the modem's web interface, and went to the ROUTING TABLE and entered this info;

MODEM IP ROUTING TABLE

DESTINATION: 192.168.1.1 (the IP I gave the router)
NETMASK: 255.255.255.0
GATEWAY: 67.136.76.98 (the gateway info I gave the router)
GATEWAY: 192.168.254.254 (I'm not sure what to put here, the modem's lan ip? Or the IP the isp gives me? Is the IP the isp gives me the WAN CONNECTIONS ip?)



Once I change the WAN IP from automatic to the specified one, everything quits working. Can someone please tell me what I'm doing wrong?

<P ID="edit"><FONT SIZE=-1><EM>Edited by bastardman on 09/21/04 00:42 AM.</EM></FONT></P>