Security
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N300 Wireless ADSL2+ Modem Router DGN2200v3
Firewall Rules to Control Network Access
Your modem router has a firewall that blocks unauthorized access to your wireless network
and permits authorized inbound and outbound communications. Authorized communications
are established according to inbound and outbound rules. The firewall has the following two
default rules. You can create custom rules to further restrict the outbound communications or
more widely open the inbound communications:
• Inbound. Block all access from outside except responses to requests from the LAN side.
• Outbound.
Allow all access from the LAN side to the outside.
Set Up Firewall Rules
The Firewall Rules screen lets you add custom rules to make exceptions to the default rules.
Exceptions can be based on the service or application, source or destination IP addresses,
and time of day. You can log traffic that matches or does not match the rule and change the
order of rule precedence.
All traffic attempting to pass through the firewall is subjected to the rules in the order shown in
the Rules table from the top (highest precedence) to the default rules at the bottom. In some
cases, the order of precedence is important to determine which communications are allowed
into or out of the network.
To set up firewall rules:
1. Select Advanced > Security > Firewall Rules to display the following screen:
2. To add an outbound rule, click Add under Outbound Services. To edit or delete a rule, select
its button on the left side and click Edit or Delete.
3. T
o change the order of precedence:
a. Select the button on the left side of the rule and click Move.
b. At the prompt, enter the number of the new position and click OK.
4. T
o open or close instant messaging, select one of the following radio buttons:
• Close IM Ports. Disables instant messaging traf
fic.
• Open IM Ports. Enables instant messaging traf
fic. IM ports are open by default.
5. Click Apply to save your settings.
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