DGFV338 ProSafe Wireless ADSL Modem VPN Firewall Router Reference Manual
Security and Firewall Protection 4-3
v1.0, April 2007
You may define additional rules that will specify exceptions to the default rules. By adding custom
rules, you can block or allow access based on the service or application, source or destination IP
addresses, and time of day.
You can also tailor these rules to your specific needs (see “Security and Administrator
Management” on page 4-35).
Outbound Rules (Service Blocking)
The DGFV338 allows you to blo ck the use of certain Internet servic es by PCs on your network.
This is called service blocking or port filtering.
The default policy can be changed to block all ou tbound traf fic and enable on ly specific services to
pass through the router. The following Outbound Services lists all the exi sting rules for outgoing
traffic. A rule is defined by the following fields:
•! (Status): A rule can be disabled if not in use and enabled as needed. A rule is disabled if the
status light is grey and it is enabled if the status light is green. Disabling a rule does not delete
the configuration, but merely de-activates the rule.
•Service Name: This is a unique name assigned to the service. The name usually indicates the
type of traffic the rule covers such as ftp, ssh, telnet, ping, etc. Services not already in the list
can be added on the Add LAN WAN Outbound Services screen.
Figure 4-1
Note: This feature is for Advanced Administrators only! Incorrect configuration will
cause serious problems.