In this example, an outside subscriber initiates PPTP tunnels to a PPTP server located in the service provider network. The PPTP connection to the server traverses an E-series router that has NAT enabled.
Figure 11: PPTP Tunnels on an Outside Network
The router has installed an inside source static simple translation in its translation table as follows:
|
Inside Local Address |
Inside Global Address |
|---|---|
|
11.11.11.1 |
20.0.0.1 |
The PPTP client initiates its tunnels to the inside global address 20.0.0.1. The E-series router translates packets destined for address 20.0.0.1 and forwards them to the inside local address of 11.11.11.1. Because GRE traffic can pass through NAT, all matching PPTP control packets are translated and forwarded to the destination.
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