STUN 5.2GB what is it ?

[mynameisjohndoe2024]

In the logs I have noticed one wireless client has Uploaded around 2.95GB and downloaded about 2.3GB showing in LOGS as "STUN" What would it be, maybe Facetime, Google meet ,video Call ?. Seems lot of bandwidth for 1/2 day ? Any ideas.

 

[Ripshod]

The only time I've used stun was for a sip phone (VoIP). I don't see that using that much data, but quite possibly video call could.
Incidentally Google run their own stun servers that are open for anyone to use, for any reason. Can you trace this data usage to a certain device? If you have an Asus router you could activate the "Statistics" in "Traffic Analyzer" to see future traffic usage by protocol and device.

 

[sfx2000]

STUN is used by many applications - as @Ripshod mentions, STUN is commonly used for VoIP apps - Teams uses it, as well as Zoom, webex, and others that might use WebRTC like Google Meet.

Oddly enough - Ookla's Speedtest.Net uses STUN as well.

 

[mynameisjohndoe2024]

Thanks for the replies. I was at first thinking it may be large video downloads, but from what I gather from logs it is Google Meet, Facetime and WhatsApp.