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Reference Manual for the ADSL Modem Router DG834 v3
3-10 Protecting Your Network
v1.1, October 2006
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 have created in the Schedule menu. You can also have the
modem router log any attempt to use Instant Messenger during that blocked period.
The parameters 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 feature 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 choose to block or allow according to the schedule you have defined in the Schedule
menu.
• LAN Users
These settings determine which packets are covered by the rule, based on their source LAN IP
address. Select the desired option:
– Any — all IP addresses are covered by this rule.
– Address range — if this option is selected, you must enter the Start and Finish fields.
Figure 3-7