Re: is public IP to NATed private IP site-to-site VPN possible?
No, although I've not done tunneling betwwen firewalls, but I've done it between routers & routers to firewalls, but the idea is one in all, the VPNtunneling should be between devices IP's that reaching each other.
In your case, if u do public ip nated to private ip, even though the 2 private IP's assigned on the both firewalls won't be reachable.
I would suggest if u can do tunneling between the 2 public IP's by changing the public IP of the other lan interface of the firewall to be assigned on the wan instead, and let the users access the Internet with usual nat, then u will be able to do tunneling between the firewalls wan interfaces public IP's.
We are pleased to announce availability of Beta software for 16.6.3.
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