Quick Reference Guide

Reference Manual for the Model DG834 ADSL Firewall Router
4-10 Protecting Your Network
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 router
log any attempt to use Instant Messenger during that blocked period.
Figure 4-7: Rule example: Blocking Instant Messenger
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.