Nat – How to configure public IP behind a modem/router (Actiontec GT724R)

ipcopmodemnat;router

I want to figureout how to use a public IP address (ISP provided) behind the modem/router.

I'm replacing an aging modem with a NEW one, which is an actiontec GT724R modem. Its manual is Here

This is how I want the setup to look like

                        IP Cop Server                            GT724R Modem
                          |        |                              |       | 
    GREEN (internal)      |        |RED (outside network)         |       | WAN IP
     ---------------------|        |------------------------------|       |------------
    10.0.0.1                       66.92.41.254                             66.92.41.44

There's an IPCop Server sitting right behind the GT724R with 2 Nics.
10.0.0.1 is internal network (GREEN) and 66.92.41.254 (RED) will be the public one.

66.92.41.254 and 66.92.41.44 are ISP provided Static IPs.

The IP COP svr is already configured this way and has a lot of setup work done already using 66.92.41.254, so hence I want to continue
to use the public address.

The old modem was in bridged mode and the new one (GT724R) is also configured to run in a similar style, which is "RFC 1483 via Static IP"
Encapsulation is "RFC 1483 bridged"

Thanks
A

Best Answer

If the new modem is indeed running in bridge mode as well, then the second/new IP should not be tied to the modem at all. It would be on the same plane as your IP Cop server/firewall. In fact, you may even be able to configure IP Cop to manage the second IP as well.

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