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Tunnel Configuration Through NAT Examples

PPTP uses enhanced GRE encapsulation for PPP payloads. After the PPTP tunnel setup process, PPP packets are exchanged using GRE encapsulation. It is critical that a NAT device that resides between PPTP client and PPTP server allow GRE flows.

This section contains NAT configuration examples for both inside and outside PPTP tunnel setup through NAT.

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