Firewall

The SX II has a firewall function to provide protection for the IP network and to control access between the internal router and LAN 1, LAN 2, and the modem interfaces.

1. Choose Security > Firewall. The Firewall page opens, displaying the existing IPTables rules.
2. Select the Enable Firewall checkbox.
3. Click OK.

   Note: When you enable IP forwarding for Dual LAN units, use IPTables rules to create policies for traffic being forwarded between LAN interfaces

   Add IPTable rules as needed. When you enable IP forwarding for Dual LAN units, use IPTables rules to create policies for traffic being forwarded between LAN interfaces.

   These rules take effect immediately but persist permanently only after clicking the Save button. If there is a mistake in the rules and as a result, the appliance becomes inaccessible, this allows you to recover from the mistake. Reboot the system. If you do not Save the rules, you lose them in the reboot.

   Rules are added using the IPTables command to the kernel.

4. Enter a rule in the IPTables Rule field the click Apply. Add as many rules as are needed.
5. Click Save. The rule is displayed on the screen.
6. You can delete some or all of the default rules if you choose to.