System Administration Guide: IP Services

Virtual Private Networks

You can use IPsec to construct a Virtual Private Network (VPN). You do this by constructing an Intranet that uses the Internet infrastructure. For example, an organization that uses VPN technology to connect offices with separate networks, can deploy IPsec to secure traffic between the two offices.

The following figure illustrates how two offices use the Internet to form their VPN with IPsec deployed on their network systems.

Figure 19–3 Virtual Private Network

Diagram shows that Offices 1 and 2 use the le0 interface to communicate with each other. Each office uses le1 for internal communication.

See How to Set Up a Virtual Private Network for a description of the setup procedure.