D-Link DFL-260E User Manual for DFL-260E - Page 409
VPN, 9.1. Overview, 9.1.1. VPN Usage
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Chapter 9. VPN This chapter describes the Virtual Private Network (VPN) functionality in NetDefendOS. • Overview, page 409 • VPN Quick Start, page 413 • IPsec Components, page 423 • IPsec Tunnels, page 438 • PPTP/L2TP, page 457 • SSL VPN, page 466 • CA Server Access, page 474 • VPN Troubleshooting, page 477 9.1. Overview 9.1.1. VPN Usage The Internet is increasingly used as a means to connect together computers since it offers efficient and inexpensive communication. The requirement therefore exists for data to traverse the Internet to its intended recipient without another party being able to read or alter it. It is equally important that the recipient can verify that no one is falsifying data, in other words, pretending to be someone else. Virtual Private Networks (VPNs) meet this need, providing a highly cost effective means of establishing secure links between two co-operating computers so that data can be exchanged in a secure manner. VPN allows the setting up of a tunnel between two devices known as tunnel endpoints. All data flowing through the tunnel is then secure. The mechanism that provides tunnel security is encryption. There are two common scenarios where VPN is used: 1. LAN to LAN connection - Where two internal networks need to be connected together over the Internet. In this case, each network is protected by an individual NetDefend Firewall and the VPN tunnel is set up between them. 409