I have a bit of a problem that I don't see a solution for and was hoping that someone here may know of a work around.
I need to create a site to site VPN connection but the problem is that only one site has an internet available ip address. The second site used to but when its ISP upgraded its service, the site was placed behind an unknown number of NAT layers. Is it possible to create a workable site to site VPN connection in this case? Are there any 3rd party products that would router a VPN connection to a NAT-ed site? Creating a VPN in one direction is no problem but the return trip is problematic. And, since there are DCs on both sites, this is more than a simple inconvenience.
On a related note, is there a way to effectively test a TMG site to site VPN? It will show whether such a connection is enabled or not but are there any tools to verify that it is up and working properly?
Thanks
Bert