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VPN Redundant IPSec VPNs

FortiGate-3000 Administration Guide 01-28006-0010-20041105 295

See “To add a firewall policy” on page 204.

6 Arrange the policies in the following order:

• outbound encrypt policies

• inbound encrypt policy

• default non-encrypt policy (Internal_All -> External_All)

Redundant IPSec VPNs

To ensure the continuous availability of an IPSec VPN tunnel, you can configure

multiple connections between the local FortiGate unit and the remote VPN peer

(remote gateway). With a redundant configuration, if one connection fails, the

FortiGate unit establishes a tunnel using the other connection.

The configuration depends on the number of connections that each VPN peer has to

the Internet. For example, if the local VPN peer has two connections to the Internet,

then it can provide one redundant connection to the remote VPN peer.

A single VPN peer can be configured with up to three redundant connections.

The VPN peers are not required to have a matching number of Internet connections.

For example, between two VPN peers, one peer can have multiple Internet

connections while the other has only one Internet connection. In the case of an

asymmetrical configuration, the level of redundancy varies from one end of the VPN to

the other.

Configuring redundant IPSec VPNs

For each FortiGate unit, first add multiple (two or more) external interfaces. Then

assign each interface to an external zone. Finally, add a route to the Internet through

each interface.

Source The local VPN spoke address.

Destination External_All

Action ENCRYPT

VPN Tunnel The VPN tunnel name added in step 1. (Use the same tunnel for all encrypt

policies.)

Allow inbound Select allow inbound.

Allow outbound Do not enable.

Inbound NAT Select inbound NAT if required.

Outbound NAT Select outbound NAT if required.

Note: The default non-encrypt policy is required to allow the VPN spoke to access other

networks, such as the Internet.

Note: IPSec Redundancy is only available to VPN peers that have static IP addresses and that

authenticate themselves to each other with preshared keys or digital certificates. It is not

available to VPN peers that have dynamically assigned IP addresses (dialup users). Nor is it

available to VPN peers that use manual keys.

Fortinet FortiGate FortiGate-3000 Administration Guide

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