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The configuration I use allows only wanted traffic between two ID-1 radios:

You need a router with each ID-1 that can do NAT (network address translation) AND simple port forwarding (or a "DMZ computer" function).? I use an old Netgear WGT624v2 (which does both), and is spec'd to take 12vDC but runs just fine (as do my other Netgear switches and routers) from a RigRunner supplying 14.2vDC.

Say computer #1 is on the 192.168.1.0/24 network with address 192.168.1.10:

I configure router #1 to have a LAN (local) address of? 192.168.1.11 (these are examples, pick your own IP addresses in the same network), and a WAN (remote) address of 10.0.0.21 (netmask 255.0.0.0).? The router then becomes a gateway to all 10.x.x.x addresses.

?I configure computer #1 to route only 10.x.x.x/8 traffic to 192.168.1.11 (the router's LAN address)? There are a couple ways to do this:

1. Use the ROUTE command at the Windows command line to add 192.168.1.11 as a gateway to the 10.x.x.x/8 network.? Type just "route" at the Windows command line to learn the settings (in Windows 7, this even displays an example).? I think the correct command in this case is "ROUTE ADD 10.0.0.0 MASK 255.0.0.0 192.168.1.11"
   
2. Go into your Windows settings and accomplish the same thing (this varies by version of Windows).
   

Connect computer #1 to a LAN port of router #1, and connect ID-1 #1 to the WAN port of router #1.

Now do exactly the same thing with computer/router/ID-1 #2, EXCEPT give router #2 a WAN address of 10.0.0.22.
If you have computer/router/ID-1 #3, #4, etc on the RF network, configure them similarly, giving each router a unique WAN address on the 10.x.x.x network.

With the radios on and enabled for data transfer, from computer #1, try to ping 10.0.0.22 (or from computer #2, try to ping 10.0.0.21).? This needs to work before you go any further.? You may have to enable WAN pings on the routers.

If the above works, you now have the basics of your network functional, but you can't (yet) pass traffic between the two computers.? To do that, you have to use the router's port forwarding or "DMZ computer" capability.

Let's say that computer #2 has a web server (typically using port 80) that computer #1 needs to access.? You configure router #2 to "port-forward" all WAN requests for port 80, to the address of computer #2.? If your router has a "DMZ" function, it's even easier:? you configure router #2 to set the "DMZ computer" to the address of computer #2.? Now computer #1 should be able to access the web server on computer #2, using IP address 10.0.0.22.

Using the "DMZ computer" function has both advantages as disadvantages:? It makes ALL of computer #2 TCP/IP ports visible on the radio network.? This helps if you want to do file sharing.

Note that all computers should address other computers on the RF network by the remote computer's router address of 10.x.x.x.

Note also that this is not the only way to do this, but it works for me.? and it keeps the local network traffic at each site, off the air.

-- Dean