What you should be able to do is have them enable port forwarding to a box that you want to allow RDP to. For example, we have a particular machine we use to access from the outside. We have port forwarding setup on our firewall so say port 12345 is forwarded to that machine. So we RDP to something like this:
10.10.10.10:12345
The router should see the request come in on that port and forward it over to your box. Might give that a shot. Remember though, the IP you'll be accessing is not your internal IP. It will be the IP your ISP issues you.
so if they issue you the IP 68.114.52.68, you should access:
68.114.52.68:12345
If I were you, let their device serve as the firewall. It's probably more robust than your little linksys and you should be able to turn off your linksys firewall. If you don't want to do that and your RDP box is behind both routers, the external router will forward to port 12345 on the linksysinterface, then port forwarding needs to be setup from the linksys over to your box.
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by: ged325Posted on 2009-02-05 at 11:56:01ID: 23563421
Setup the firewall as followS:
Their router.
Server:
Port forward 3389 to <public ip> of the linksys.
then in linksys re-forward 3389 to <static ip> of server.
XP:
Port forward 3390 to <public ip> of the linksys.
then in linksys re-forward 3390 to 3389 for IP of machine
Repeat as necessary incrementing the ports.