When the address translation is set up in the NAT table, the networks and computers are initially only visible under a different address in the higher-level network. For the seamless routing of data between the networks, further settings are required:
- Entries in the routing tables, so that packets with their new addresses can find their way to the destination.
- DNS forwarding entries so that requests for specific devices in the other networks can be resolved to the mapped IP addresses.
- The firewall rules in the gateways must be adapted in such a way that, if necessary, it is also possible to connect to the accessible stations or networks from the outside.
- VPN rules for loopback addresses so that the newly assigned IP addresses can also be transmitted through the corresponding VPN tunnels.
Note: The device performs IP address translation between the firewall and IP router on the one hand and the VPN module on the other. Rules that relate to their own local network therefore use the "unmapped" original addresses. Entries for the remote network therefore use the "mapped" addresses of the remote site, which are valid on the VPN connection.
