1) Use the LANconfig Setup Wizard to configure an IKEv2 VPN connection at both ends. The procedure is described in this Knowledge Base document.In this example, all of the local stations in the network at the headquarters are to be masked behind the IP address 10.10.10.1.
2) In LANconfig, open the configuration dialog for the LANCOM router at the headquarters and switch to the menu item IP router → Routing → IPv4 routing table.
3) Edit the existing routing entry for the VPN connection to the branch office.
Here, the parameter IP masquerading needs to be set to the value Masking intranet and DMZ.