Juniper IP SERVICES - CONFIGURATION GUIDE V 11.1.X, Руководство по настройке

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Clients on an Inside Network
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 Global Address Inside Local Address
20.0.0.1 13.1.2.3
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.
Clients on an Outside Network
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
Tunnel Configuration Through NAT Examples
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Chapter 2: Configuring NAT