![]() Although PPTP itself can use any PPP authentication mechanism, MPPE requires encryption keys generated by MS-CHAP v1 or v2, or EAP-TLS. Microsoft’s PPTP uses MPPE to encrypt the data in a PPTP VPN, providing the security for the data that travels between the VPN client and server. PPTP is also capable of car-rying non-IP traffic, making it ideal for applications where legacy network transports such as IPX/SPX, NetBEUI, AppleTalk, or others may be required. Also, a Network Address Translator (NAT) can translate PPTP traffic and consequently will allow PPTP traffic streams to be directed through routers or corporate firewalls. The basic simplicity of PPTP is one of its biggest advantages because PPTP operation is not based on a certificate infrastructure. PPTP does not specify any changes to the PPP protocol, but rather describes a new vehicle for carrying PPP. This RFC specifies “a protocol which allows the Point to Point Protocol (PPP) to be tunneled through an IP network” PPTP is documented by the IETF in RFC 2637. The PPTPv2 protocol supports 40-bit and 128-bit encryption. ![]() After its release, several security vulnerabilities were discovered in Microsoft’s original implementation of PPTP, which prompted a revamping of this protocol. The version of PPTP that ships with Windows Server 2003 is PPTP version 2. PPTP can use any of the authentication schemes that are supported by PPE The encapsulated tunnel data may either be encrypted, compressed, or both. Next, a modified version of the Generic Route Encapsulation (GRE) protocol packages PPP flames for encapsulated tunnel data. First, a TCP connection handles tunnel management on TCP port number 1723. There are two components to a PPTP connection. PPTP works with remote access connections (remote client calling remote access server) or with router-to-router VPN connections. PPTP transmits data over a TCP/IP connection by encapsulating PPP flames in IP data-grams. Microsoft first introduced PPTP with Windows NT 4.0 Beta Release 2. Robotics, Ascend, and ECI Telematics), developed the PPTP. The PPTP Forum, a joint venture between Microsoft and several other companies with interests in remote access technology (3COM, U.S. Laura Hunter, in MCSA/MCSE (Exam 70-291) Study Guide, 2003 PPTP/MPPE MCSA/MCSE 70-291: Configuring the Windows Server 2003 Routing and Remote Access Service VPN Servicesĭeborah Littlejohn Shinder.
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