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Page 48 NB1300Plus4 ADSL Modem
Security
Configuring Policies
Once you've created entries in the NB1300Plus4W's group databases, it is time to create a
policy. A policy is a firewall rule which governs data passing through the firewall. You can create
an inbound policy - a policy for data coming in from the internet or an outbound policy which is
a policy for data going out to the internet.
To create an inbound policy, click on the inbound policy link under the "Inbound /Outbound
policies" heading. You will now be presented with an Adding New Policy screen.
Firstly, you can specify whether the rule applies to a certain IP, IP range or any IP. You can also
specify a range created in the IP Group if you've done so by using the "DB" drop down box.
This must be done for both the Source IP and the Destination IP,
Secondly you can specify which ports this rule applies to. You can either specify the ports
manually, or use a group database rule if you've created one previously.
Now, select the Transport Protocol, which can be TCP, UDP or both. You can also enable
reverse NAT if you wish. Also select whether this rule applies an Allow or Deny action.
The next sections (Time window, ftp content, SMTP content, http content) refer directly to
group databases. If you haven't created any rules under the relevant group database, you will not
be able to use these sections. Select the relevant rules using the drop down box.
Once you've finished click on "Add Modify inbound policy" to add the rule to the database. You
should now see it listed under the Inbound Policy screen. To create more rules, you will need to
click on the "Add" button.
The Outbound Policy screen is essentially the same, other than it deals with outgoing
connections rather than incoming connections. You can modify policies in either screen by
clicking on "edit" for the rule you wish to modify.
Remember if you've added changed any entries, you must save them to flash by clicking on Save
Firewall Configuration at the bottom of the Firewall Configuration screen. Then you'll need to
press Save Settings and Reboot on the side menu, then clicking "Save & Reboot".