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The most common techniques to interconnect 2 separated sites over internet are:

NAT and PORT Forwarding technique

Since connection is established from 2N Access Commander to each 2N IP device, you need to make sure that all 2N IP devices are reachable over the internet. In standard environment, such 2N IP devices will have private IP addresses and only one shared public IP address actually reachable from internet.



With its specific implementation on your sites and network devices, any Network company/administrator will be able to help you.

VPN technique

A site-to-site VPN connection connects two portions of a private network or two private networks.