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: (

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;


SPECIFIED IP ADDRESS: (the lan ip for the router is I just made not really knowing if that is ok)
DEFAULT GATEWAY: (the modem's lan ip)
DNS: (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;


DESTINATION: (the IP I gave the router)
GATEWAY: (the gateway info I gave the router)
GATEWAY: (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>
4 answers Last reply
More about forwarding ports modem router
  1. can't you just disable the firewall on the modem?

    <pre> \|/
    jlanka (. .)
  2. No. If I disable the modem's fire wall, it also disables NAPT. And I haven't been able to figure out how to set up a static route from the modem to the router (sorry it took me so long to respond)
  3. personally, I'd just get a regular DSL modem without a built-in router. It would simplfy things greatly. There are tons on eBay under 40 dollars.

    <pre> \|/
    jlanka (. .)
  4. I guess that is what I'm going to have to do :(
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