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ZyXEL Communications Internet Security Gateway 10~100 Series User Manual

Page 45

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ZyWALL 10~100 Series Internet Security Gateway

PPTP

7-3

Diagram 7-3 Example Message Exchange between PC and an ANT

PPP Data Connection

The PPP frames are tunneled between the PNS and PAC over GRE (General Routing Encapsulation, RFC
1701, 1702). The individual calls within a tunnel are distinguished using the Call ID field in the GRE header.