Rumour has it that TKIP is a weak encryption but Wireshark doesn't contain tools for decrypting TKIP without knowing the passphrase. I suppose you do have the passphrase, otherwise the quest would have no solution. 2) On the controller, start the raw packet capture from WebUI or CLI. Apply the capture filter as udp port 5000 or whatever port you want. There is another nice function of Wireshark which allows you to save the html pages transmitted by packets captured, so you may even see the graphical rendering of them if you open the saved files in a browser. Choose the wired port interface (en0 on Mac OSX, or eth0 on Linux). Once you succeed here, there should be a plaintext http communication which should contain the information about router firmware version etc., and the IP addresses will become visible. The file contains the WPA negotiation of two Apple devices so if you know the passphrase to the WiFi network, you should be able to make Wireshark decrypt the WPA communication for you, there is a Wireshark manual page covering that topic and a number of Questions on this site, dealing with some issues people ran into. Select all available interfaces from the pop-up window, or just the ones you want to capture.

Capturing packets on the switch You can also use sensors to monitor data packets on an individual switch. Well, you have changed the scope of the question seriously - this is not a single packet, this is a capture of a good deal of wireless traffic. Tap Capture at the top of the screen and then Interfaces from the drop-down menu. Capturing packets on the router Connect PRTG to the monitoring port of a router or send flows to PRTG and use corresponding sensors to capture all data packets which pass through it.

Wireshark packet capture on router