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Point-to-Point Tunneling Protocol
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==Description== A PPTP tunnel is instantiated by communication to the peer on [[Transport Control Protocol|TCP]] port 1723. This TCP connection is then used to initiate and manage a [[Generic Routing Encapsulation|GRE]] tunnel to the same peer. The PPTP GRE packet format is non standard, including a new ''acknowledgement number'' field replacing the typical ''routing'' field in the GRE header. However, as in a normal GRE connection, those modified GRE packets are directly encapsulated into IP packets, and seen as IP protocol number 47. The GRE tunnel is used to carry encapsulated PPP packets, allowing the tunnelling of any protocols that can be carried within PPP, including [[Internet Protocol|IP]], [[NetBEUI]] and [[IPX]]. In the Microsoft implementation, the tunneled PPP traffic can be authenticated with [[Password authentication protocol|PAP]], [[Challenge-handshake authentication protocol|CHAP]], [[MS-CHAP|MS-CHAP v1/v2]] .
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