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

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Presentation on theme: "Microsoft Windows Server 2003 TCP/IP Protocols and Services Technical Reference Slide: 1 Lesson 23 Virtual Private Networks (VPNs)"— Presentation transcript:

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

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

3 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)

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

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

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

7 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

8 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

9 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

10 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

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

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

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