D-Link DFL-1600 User Manual page 258

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5. L2TP Server
Next step is to configure the L2TP server.
Interfaces L2TP/PPTP Servers
Server:
General
Enter the following:
Name: L2TPServer
Inner IP Address: This is the IP address of the L2TP server inside the
tunnel. In this case 192.168.1.1
Tunnel Protocol: L2TP
Outer Interface Filter: L2TPIPsecTunnel
Server IP: This is the IP that remote users will connect to, in this case
10.0.0.1
PPP Parameters
Use User Authentication Rules: Enable (Specifies that authentication
should be performed)
Microsoft Point-to-Point Encryption (MPPE): Select the encryption
strengths to allow.
IP Pool: 192.168.1.10-192.168.1.20 (The pool of IP addresses to assign IP:s
from to connecting users)
DNS (Primary/Secondary): Specify any eventual DNS servers to hand
out to connected clients.
NBNS (Primary/Secondary): Specify any eventual NBNS (WINS)
servers to hand out to connected clients.
Add Route
Proxy ARP: Leave as default, or specifically select the LAN interface if
the IP:s in the IP Pool are a part of the network on the LAN interface.
Then click OK
D-Link Firewalls User's Guide
Chapter 22. VPN Protocols & Tunnels
Add L2TP/PPTP