1.4 Relationship to Other Protocols

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PPTP has two parallel components, as specified in [RFC2637] section 1.3:

  • A control connection between each PAC/PNS pair operating over TCP.

  • An IP tunnel operating between the same PAC/PNS pair, which is used to transport GRE encapsulated PPP packets for user sessions between the pair.

The following diagram demonstrates the relationship of these parallel components to PPTP.

Relationship of parallel components to PPTP

Figure 1: Relationship of parallel components to PPTP