If, on the other hand, computer A in LAN 1 requires a connection to computer B in LAN 2, for example when headquarters carries out remote maintenance at the external locations, then gateway 1 receives the request and attempts to establish a VPN tunnel to gateway 2. Gateway 2 only has a dynamic IP address and cannot be directly contacted over the Internet.
With LANCOM Dynamic VPN, the VPN tunnel can be set up nevertheless. The connection is established in three steps: