Reverse NAT on both VPN gateways

Well the subject pretty much says it. With networks being 192.168.0.0/18 and 10.0.0.0/8, how do you connect 2 of the same. What I have been doing is Natting with one to one static ratios for each device needed. This has worked for years.

I have done this as a Cisco enviornment. Using Cisco VPN 3000 Series Concentrators and even 900 series.

I have done this CP to CP.

But what about CP to cisco? Only once once, to a CP 4.1 to a 900 series. Can CP/AI do this on a Nokia box to a Cisco? I know both real well. You input is appreciated.