Chapter 6. Ipsec / Pptp / L2Tp Vpn - D-Link DSR-250N User Manual

Unified Services Router

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 initiat es 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. The
gateway WAN port acts as responder.

PPTP server for LAN / WAN PPTP client connections.

L2TP server for LAN / WAN L2TP client connections.
Fig ure 53: E xam ple of Gateway -to -Gat eway IPsec V PN tunnel using t wo
DSR routers co nnected t o t he I nternet
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