56 Fortinet Inc.
Configuration example: Multiple connections to the Internet NAT/Route mode installation
3 Select New to add a route for connections to the network of ISP1.
• Destination IP: 100.100.100.0
• Mask: 255.255.255.0
• Gateway #1: 1.1.1.1
• Gateway #2: 2.2.2.1
• Device #1: port2
• Device #2: port3
4 Select New to add a route for connections to the network of ISP2.
• Destination IP: 200.200.200.0
• Mask: 255.255.255.0
• Gateway #1: 2.2.2.1
• Gateway #2: 1.1.1.1
• Device #1: port3
• Device #2: port2
•Select OK.
5 Change the order of the routes in the routing table to move the default route below the
other two routes.
• For the default route select Move to .
• Type a number in the Move to field to move this route to the bottom of the list.
If there are only 3 routes, type 3.
•Select OK.
Adding the routes using the CLI
1 Add the route for connections to the network of ISP2.
set system route number 1 dst 100.100.100.0 255.255.255.0 gw1
1.1.1.1 dev1 port2 gw2 2.2.2.1 dev2 port3
1 Add the route for connections to the network of ISP1.
set system route number 2 dst 200.200.200.0 255.255.255.0 gw1
2.2.2.1 dev1 port3 gw2 1.1.1.1 dev2 port2
2 Add the default route for primary and backup links to the Internet.
set system route number 3 dst 0.0.0.0 0.0.0.0 gw1 1.1.1.1
dev1 port2 gw2 2.2.2.1 dev2 port3
The routing table should have routes arranged as shown in Table 1 3.
Table 13: Example combined routing table
Destination IP‘ Mask Gateway #1 Device #1 Gateway #2 Device #2
100.100.100.0 255.255.255.0 1.1.1.1 port2 2.2.2.1 port3
200.200.200.0 255.255.255.0 2.2.2.1 port3 1.1.1.1 port2
0.0.0.0 0.0.0.0 1.1.1.1 port2 2.2.2.1 port3
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