Configuration example: Multiple connections to the Internet | NAT/Route mode installation |
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Firewall policy example
Firewall policies control how traffic flows through the FortiGate unit. After you configure routing for multiple Internet connections, you must create firewall policies. Firewall policies control which traffic is allowed through the FortiGate unit and the interfaces that this traffic can connect through.
For traffic originating on the internal network to be able to connect to the Internet through both Internet connections, you must add redundant policies from the internal interface to each interface that connects to the Internet. After you add these policies, the routing configuration controls which Internet connection is used.
Adding a redundant default policy
Figure 9 on page 51 shows a FortiGate unit connected to the Internet using its internal and DMZ interfaces. The default policy allows all traffic from the internal network to connect to the Internet through the external interface. If you add a similar policy to the internal to DMZ policy list, this policy allows all traffic from the internal network to connect to the Internet through the DMZ interface. With both these policies added to the firewall configuration, the routing configuration determines which Internet connection the traffic from the internal network uses. For more information about the default policy, see “Default firewall configuration” on page 186.
To add a redundant default policy
1Go to Firewall > Policy >
2Select New.
3Configure the policy to match the default policy.
Source Internal_All
Destination DMZ_All
Schedule | Always |
Service | ANY |
Action | Accept |
NAT | Select NAT. |
4Select OK to save the changes.
Adding more firewall policies
In most cases your firewall configuration includes more than the default policy. However, the basic premise of creating redundant policies applies even as the firewall configuration becomes more complex. To configure the FortiGate unit to use multiple Internet connections you must add duplicate policies for connections between the internal network and both interfaces connected to the Internet. As well, as you add redundant policies, you must arrange them in both policy lists in the same order.
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