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70 DOMINION SX USER GUIDE
Firewall
The DSX provides a firewall function to provide protection for the IP network and to control
access between the internal router and the LAN 1, LAN 2 and the dial modem interfaces.
Enable the Firewall
To enable the firewall:
1. Click the Security tab, and then click Firewall. The Firewall Screen appears. The Firewall
screen displays the existing IPTables rules.
Figure 63 Firewall Screen
2. Click the check box labeled Enable Firewall.
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 an IPTables Rule
To add an IPTables rule:
1. Click the Security tab, and then click Firewall. The Firewall Screen appears. The firewall
screen displays the default IPTables rules.
2. Go to the Add/Delete IP Tables Rule field and enter a rule.
3. Click Apply, and then click Save. The rule is displayed on the screen.
4. Delete some or all of the default rules if you choose.
5. Add new rules if you choose.
Note: Rules are added using the IP Tables command to the kernel. These rules take effect
immediately but persist permanently only after clicking the Save button.
Note: If there is a mistake in the rules and as a result, the unit becomes inaccessible, the Save
action allows you to recover from the mistake. Reboot the system. If you do not Save the rules,
you lose them in the reboot.