L2Tp - D-Link DFL-1600 User Manual

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2. Routes
The final step is to configure a single-host route to the PPTP server
over the WAN interface.
Routing Main Routing Table
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
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
Chapter 22. VPN Protocols & Tunnels
Add Route:
9.4.1