Microsoft® Forefront® Threat Management Gateway (TMG) Administrator’s Companion

Chapter 27. Implementing Site-to-Site VPN

• Configuring L2TP Over IPsec Site-to-Site VPN 774

• Configuring PPTP Site-to-Site VPN 782

• Troubleshooting VPN Client Connections 788

• Summary 794

A Virtual Private Network (VPN) allows a private network to be extended across other shared networks like the Internet. VPN connections allow users who work at home or are travelling to access their corporate network and access files just as if they were in the office. VPN connections also allow organizations to have routed connections with other organizations over a public network, such as the Internet, while maintaining secure communications (for example, between offices that are geographically separate). A routed VPN connection across the Internet logically operates ...