VPNs provide:

• Data integrity: Data integrity ensures that no one has tampered with or modified data while it traverses the network. Data integrity is maintained with hash algorithms.
• Authentication: Authentication guarantees that data you receive is authentic; that is, that it originates from where it is supposed to, and not from someone masquerading as the source. Authentication is also ensured with hash algorithms.
• Confidentiality: Confidentiality ensures data is protected from being examined or copied while transiting the network. Confidentiality is accomplished using encryption.

An IP Security (IPsec) VPN secures communications and access to network resources for site-to-site access using encryption, authentication, and key management protocols. On a properly configured VPN, communications are secure, and the information that is passed is protected from attackers.

The vRouter currently supports site-to-site IPsec VPN connectivity on both IPv4 and IPv6 networks (IPv4 traffic over IPv4 IPsec tunnels, and IPv6 traffic over IPv6 IPsec tunnels). Site-to-site VPN connections are normally established between two (or more) VPN gateways and provide connectivity for user hosts, servers, and other devices at each location. Connectivity is normally based on IP source and destination network pairs, allowing multiple hosts to share the same tunnel between locations.

Site-to-site VPNs enable enterprises to create low-cost connectivity between offices. These site-to-site VPNs frequently replace more expensive WAN technologies such as private lines or Frame Relay.