1. Navigate to System | Routing | Gateways.
2. On the Gateways tab, click on Add.
3. Set Interface to LAN:

4. Enter an appropriate name in the Name edit box.
5. In the Gateway text field, enter 192.168.1.2.
6. In the Monitor IP text field, enter an IP for monitoring the gateway.
7. Enter a brief description in the Description text field.
8. When done, click on the Save button.
9. Click on the Apply Changes button.
10. Click on the Static Routes tab.
11. Click on the Add button.

12. In the Destination network text field, enter 192.168.2.0. In the adjacent CIDR drop-down box, select 24:

13. In the Gateway drop-down menu, select the gateway created in steps 1-9.
14. Enter a brief description in the Description text field.
15. Click on the Save button.