Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 1 Lesson 23 Virtual Private Networks (VPNs)

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Presentation transcript:

Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 1 Lesson 23 Virtual Private Networks (VPNs)

Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 2 Virtual Private Networks (VPNs) Overview of VPNs PPTP L2TP/IPSec

Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 3 Overview of VPNs VPN clients and servers Types of VPN connections Remote access Router-to-router VPN protocols Point-to-Point Tunneling Protocol (PPTP) Layer Two Tunneling Protocol with Internet Protocol Security (L2TP/IPSec)

Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 4 Virtual Private Networking

Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 5 Tunnelling in VPNs

Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 6 Tunnelling Architecture in Windows NDIS Mini Port Wrapper

Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 7 Overview of VPNs (continued) VPNs and PPP User authentication Data compression Data encryption (for PPTP) VPN address assignment VPN data compression VPN data encryption

Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 8 PPTP Data Encapsulation User Data TCP UDP IP Original IP Datagram PPPGREIP Encrypted PPP Payload IP addresses based on transit network IP addresses based on private network

Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 9 PPTP Control Connection PPTP control connection creation PPTP control connection maintenance PPTP control connection termination

Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 10 L2TP/IPSec Data Encapsulation User Data TCP UDP IP Original IP Datagram PPPL2TPUDPIP User Data TCP UDP IPPPPL2TPUDPIP IPSec ESP Trailer IPSec AUTH Trailer IPSec ESP Header L2TP – without encryption L2TP – With IPSec encryption Original IP Datagram Encrypted with IPSec IP addresses based on transit network IP addresses based on private network

Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 11 L2TP Connection L2TP connection creation L2TP connection maintenance L2TP connection termination

Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 12 Review Overview of VPNs PPTP L2TP/IPSec