D-Link DSR-250 Product Manual - Page 90
Ipsec / Pptp / L2tp Vpn
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Unified Services Router User Manual Chapter 6. IPsec / PPTP / L2TP VPN A VPN provides a secure communication channel (―tunnel‖) between two gateway routers or a remote PC client. The following types of tunnels can be created: Gateway-to-gateway VPN: to connect two or more routers to secure traffic between remote sites. Remote Client (client-to-gateway VPN tunnel): A remote client initiates a VPN tunnel as the IP address of the remote PC client is not known in advance. The gateway in this case acts as a responder. Remote client behind a NAT router: The client has a dynamic IP address and is behind a NAT Router. The remote PC client at the NAT router initia tes a VPN tunnel as the IP address of the remote NAT router is not known in advance. T he gateway WAN port acts as responder. PPTP server for LAN / WAN PPTP client connections. L2TP server for LAN / WAN L2TP client connections. Figure 53: Example of Gateway-to-Gateway IPsec VPN tunnel using two DSR routers connected to the Internet 88