In this example, a subscriber on the inside network is initiating PPTP tunnels to a PPTP server located in the outside network. The PPTP connection to the server traverses an E-series router that has NAT enabled.
Figure 10: PPTP Tunnels on an Inside Network
The router has installed an inside source static simple translation in its translation table as follows:
|
Inside Local Address |
Inside Global Address |
|---|---|
|
13.1.2.3 |
20.0.0.1 |
The PPTP client initiates its tunnels to the server at 11.11.11.1. The E-series router translates the SA from inside local 13.1.2.3 to inside global SA 20.0.0.1. Because GRE traffic can pass through NAT, all matching PPTP control packets are translated and forwarded to the destination.
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