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Reference Manual for the Model DG824M Wireless ADSL Modem Gateway
4-10 Protecting Your Network
Outbound Rules (Service Blocking)
The DG824M allows you to block the use of certain Internet services by PCs on your network.
This is called service blocking or port filtering. You can define an outbound rule to block Internet
access from a local PC based on:
• the IP address of the local PC (source address)
• the IP address of the Internet site being contacted (destination address)
• the time of day
• the type of service being requested (service port number)
Following is an application example of outbound rules:
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
gateway log any attempt to use Instant Messenger during that blocked period.
Figure 4-7: Rule example: Blocking Instant Messenger