Chapter 3: Protecting Your Network
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43
N300 Wireless Gigabit ADSL2+ Modem Router DGN3500 User Manual
Outbound Rule Example: Blocking Instant Messenger
If you want to block Instant Messenger usage by employees during working hours, you can
create an outbound rule to block that application from any internal IP address to any external
address according to the schedule that you create in the Schedule screen.You can specify
that the wireless modem router logs any attempt to use Instant Messenger during this
blocked period. You can also open or close AOL or MSN Instant Messenger ports: see the
Firewall Rules screen in the
Order of Precedence for Rules
on page 44.
Figure 20.
The settings are:
•
Service
. From this list, select the application or service to be allowed or blocked. The list
already displays many common services, but you are not limited to these choices. Use
the
Add Custom Service
button in the Services screen to add any additional services or
applications that do not already appear.
•
Action
. Choose how you want this type of traffic to be handled. You can block or allow
always, or you can block or allow according to the schedule you have defined in the
Schedule screen.
•
LAN Users
. These settings determine which packets are covered by the rule, based on
their source LAN IP address. Select the option that you want:
-
Any
. All IP addresses are covered by this rule.
-
Address range
. If this option is selected, you must fill in the
Start
and
Finish
fields.
-
Single address
. Enter the required address in the
Start
field.
•
WAN Users
. These settings determine which packets are covered by the rule, based on
their destination WAN IP address. Select the option that you want:
-
Any
. All IP addresses are covered by this rule.
