Secure tunneling

You can configure WAN optimization rules to use AES‑128bit‑CBC SSL to encrypt the traffic in the WAN optimization tunnel. WAN optimization uses FortiASIC acceleration to accelerate SSL decryption and encryption of the secure tunnel. Peer-to-peer secure tunnels use the same TCP port as non-secure peer-to-peer tunnels (TCP port 7810).

To use secure tunneling, you must select Enable Secure Tunnel in a WAN optimization rule and add an authentication group. The authentication group specifies the certificate or pre-shared key used to set up the secure tunnel. The Peer Acceptance setting of the authentication group does not affect secure tunneling.

The FortiGate units at each end of the secure tunnel must have the same authentication group with the same name and the same configuration, including the same pre-shared key or certificate. To use certificates you must install the same certificate on both FortiGate units.

For active-passive WAN optimization you can select Enable Secure Tunnel only in the active rule. In peer-to-peer WAN optimization you select Enable Secure Tunnel in the WAN optimization rule on both FortiGate units. For information about active-passive and peer-to-peer WAN optimization, see

For a secure tunneling configuration example, see .