VPN NAT one side public facing other

Hiya

we have 2 sites we want to connect via VPN.

site 1: private subnet behind NAT
site 2: group of servers with public IP addresses which are public facing.

both sites have mikrtik routers between which we want to create the VPN.

as only one site has a private subnet behind a nat is it still possible to create a VPN.

The servers at site 2(public facing) need to be able to see servers on the private subnet(site1) as been local.

we will have Exchange servers on the servers at Site2(public facing) and the server at site 1 will be a file share witness for quorum.

we therefore need a VPN as there will be some AD authentication needed.

Mike

Have you tried? http://lmgtfy.com/?q=mikrotik+vpn+site+to+site