User's Manual

66xx/67xx Router Users Guide 74
VPN
The VPN (Virtual Private Network) option creates a layer 2 tunnel, so even though separated by
distance and other intervening layer 2 devices, the downstream devices appears to be on the
same IP subnet.
The Layer 2 connection uses Point to Point Protocol (PPP). A PPPoE WAN interface must be
created first so it can be selected as the WAN Interface.
Description: A descriptive name for the VPN tunnel
WAN Interface: The WAN Interface for the VPN tunnel.
L2TP Server IP: The IP address for the Layer 2 server.
L2TP Username/Password: The username and password to connect to the Layer 2 server.
Authentication: The authentication method to use when connecting to the Layer 2 server.
Enable MPPE: Enables Microsoft Point-to-Point Encryption.
MTU: The Maximum Transmission Unit size for communications between the device and the
Layer 2 server.
Enable NAT: Enable Network Address Translation.
Enable Fullcone NAT: Enable NAT with extended port numbering for the public IP address.
Enable L2TP Reconnect: Enable reconnection to the Layer 2 Server. When selected, also enter
the snooze time-out PPP in seconds (the amount of time between activities to reconnect)
and the number of retries.
Dial on demand (with idle timeout timer): Enables the ability to dynamically connect to L2TP
server when data is detected on the LAN interface for the L2TP tunnel.
Enable Firewall (SPI): Enables the Firewall with stateful packet inspection.
Once configured, click Next, then in the next screens (as with other WAN interfaces), move the
new Available Routed WAN Interfaces and Available WAN Interface to the selected region for
the Default Gateway and the DNS Server Configuration screens, then click Next and
Apply/Save in the Summary screen.