D-Link DFL-2500 User Guide - Page 253
Routes, Routing, Main Routing Table, Route, Interface, Network, Gateway, Local IP Address, Metric,
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234 Chapter 22. VPN Protocols & Tunnels 2. Routes The final step is to configure a single-host route to the PPTP server over the WAN interface. Routing → Main Routing Table → Add → Route: Enter the following: Interface: WAN Network: 10.0.0.1 (IP of the PPTP server) Gateway: The gateway on the WAN network. None if no gateway is used. Local IP Address: (None) Metric: 0 Then click OK When the configuration is saved and activated, the PPTP client should connect to the PPTP server, and all traffic (except traffic to 10.0.0.1) should be routed over the PPTP interface. 22.2.2 L2TP The Layer Two Tunneling Protocol (L2TP) is an extension based on PPP, which is more flexible than PPTP and IPsec in that it uses the UDP protocol for communication, which makes it easier to traverse routers with NAT. In addition, L2TP supports multiple calls for each tunnel while only one connection per tunnel is allowed by PPTP or IPsec tunneling. L2TP tunneling format L2TP relies on the PPP protocol to encapsulate datagrams (see 9.4.1 PPP). The PPP frame is then encapsulated into a L2TP header, which is in turn packed with an UDP and IP header to conform to the Internet addressing convention, shown in Table 22.2. Data-link layer header and trailer are put onto the L2TP encapsulated packet to form the tunneling data. L2TP uses UDP port 1701 for it's control and data connections. L2TP authentication PPTP and L2TP tunnels use the same authentication mechanisms as PPP connections such as, PAP, CHAP, MS-CHAP v1 and v2. D-Link Firewalls User's Guide
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