this is called service blocking or port filtering. you can define an outbound rule to block internet access from a local computer based on:
1 ip address of the local computer (source address)
2 ip address of the internet site being contacted (destination address)
3 time of day
4 type of service being requested (service port number)
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.
