As of Firmware 6.3, Peplink routers can block traffic from specific applications.
To begin navigate to Network > Firewall > Content Blocking (For MAX Devices: Advanced > Content Blocking).
Click the drop-down menu under Application Blocking to select your application, and the click the + button to add the application to the blocking list.
Click the Apply Changes button on the top left hand corner to implement your changes
Setting Exempted User Groups and Subnets
You can also set up specific user groups or subnets to exempt from web blocking and application blocking. Simply click the checkbox for the groups you wish to exempt, and add your network and subnet masks. Please note that these exemptions affect both web and application blocking.