The document discusses the design of a virtual private network (VPN). Key points: 1) A VPN allows hosts scattered across different locations to communicate as if they are on the same local area network by simulating the LAN topology over the Internet. 2) The goal is to design a VPN that provides a generic virtual network interface to allow any network layer protocol (e.g. AppleTalk, IPX) to function, not just IP. 3) The proposed solution uses encapsulation and decapsulation of VPN packets within IP packets to transmit them over the Internet. A "shim header" is added to direct packets to the correct destination VPN client.

1. PROJECT PRESENTATION FOR CE/CS 6345 ENGINEERING OF PACKET SWITCHED NETWORKS SUBMITTED BY SHUBHAYU ROY. Design of a VPN The University Of Texas At Dallas. Richardson Texas .

7. Design

12. Model Packet from VLAN sender host encapsulated in IP packet . IP destination is initially that of central server The server queries the database to get the public IP and port of VPN destination host The encapsulated packet arrives at destination host. This packet is decapsulated to get the VPN packet which is then written by VPN client program to the TUN interface IP datagram to dest vpn host sent directly to VPN destinatin Destination host infor for caching

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