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7 Tunneling Protocols
7-2
VPN 3000 Concentrator Series User Guide
Configuration | System | Tunneling Protocols
This section of the Manager lets you configure system-wide parameters for tunneling protocols.
•
PPTP: Configure PPTP parameters.
•
L2TP: Configure L2TP parameters.
• IPSec: Configure IPSec parameters and connections.
– LAN-to-LAN: IPSec LAN-to-LAN connections between two VPN Concentrators (or between the
VPN Concentrator and another secure gateway).
–
IKE Proposals: IKE proposals for IPSec Security Associations and LAN-to-LAN connections.
Figure 7-1: Configuration | System | Tunneling Protocols screen
Configuration | System | Tunneling Protocols | PPTP
This screen lets you configure system-wide PPTP (Point-to-Point Tunneling Protocol) parameters.
The PPTP protocol defines mechanisms for establishing and controlling the tunnel, but uses Generic
Routing Encapsulation (GRE) for data transfer.
PPTP is a client-server protocol. The VPN Concentrator always functions as a PPTP Network Server
(PNS) and supports remote PC clients. The PPTP tunnel extends all the way from the PC to the VPN
Concentrator.
PPTP is popular with Microsoft clients. Microsoft Dial-Up Networking (DUN) 1.2 and 1.3 under
Windows 95/98 support it, as do versions of Windows NT 4.0 and Windows 2000. PPTP is typically used
with Microsoft encryption (MPPE).
You can configure PPTP on rules in filters; see
Configuration | Policy Management | Traffic Management.
Groups and users also have PPTP parameters; see
Configuration | User Management.