VPN Setup Help

I have two sites that I would like to connect together via VPN connections.
Each site has a cisco rv082 router.

At the first site, it should be very straightforward, the WAN IP of the router is the same as the external/public IP, and the internal LAN network range is 192.168.1.X

At the second site, the router sits behind a home modem from an ISP, and so the home modem has the public IP, the router has a different wan IP, in this case and the LAN network range is 192.168.2.X.

So I'm not sure how to proceed with the setup since the second site has different WAN/public IPs for the router interface. Do I need to setup a 1 to 1 NAT to map the router's WAN IP to the modems public IP?

Thanks for any assistance.
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  1. FYI, I found out that the reason the second site has a different WAN IP from the public is that its got a DMZ setup. I believe there is a setting on the modem that should allow that to pass through, so maybe this will be straightforward, i.e. normal VPN setup.
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