L2tp version 3, Pptp client usage – Amer Networks E5Web GUI User Manual
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Activity Sense - Specifies if dial-on-demand should trigger on Send or Recv or both.
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Idle Timeout - The time of inactivity in seconds to wait before disconnection.
Using the PPTP Client Feature
One usage of the PPTP client feature is shown in the scenario depicted below.
Here a number of clients are being NATed through cOS Core before being connected to a PPTP
server on the other side of the Clavister Security Gateway. If more that one of the clients is acting
as a PPTP client which is trying to connect to the PPTP server then this will not work because of
the NATing.
One way of achieving multiple PPTP clients being NATed like this is to use the PPTP ALG (see
Section 6.2.7, “The PPTP ALG”). Another way is for the Clavister Security Gateway to act as a PPTP
client when it connects to the PPTP server and the setup for this requires the following:
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A PPTP tunnel is defined between cOS Core and the server.
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A route is added to the routing table in cOS Core which specifies that traffic for the server
should be routed through the PPTP tunnel.
Using this client approach is suitable for situations where an ISP requires PPTP for authentication.
Figure 9.3. PPTP Client Usage
9.5.5. L2TP Version 3
Chapter 9: VPN
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