This article explains how user can configure packet capture on mist. 

• Login to Mist Dashboard
• Navigate to Site → Wan Edge Packet Captures

• Select the Site from the drop-down list as highlighted and a WAN Edge device and then add port number(s) on which packets needs to be captured

• Filters can be used while selecting the interfaces which will be used accordingly for capturing the packets as highlighted

• Click on the Start button once the device and ports are selected

‘Start Capture' button would be changed to 'Stop Capture’ button as shown below so that user can stop the on-going capture at any time.

• Once the config gets deployed on the SRX Device, live captures can be seen on the page as shown clicking on the same will expand and show the packet details

• The captured files will be saved and the same can be downloaded. Up to 3 days of captured files can be saved and be shown on MIST