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I was recently using the device speed test functionality on Google Wifi (https://support.google.com/wifi/answer/7578264) and it got me wondering how this works. Ping works to arbitrary devices because they respond to ICMP, but how does a speed test to an arbitrary host work? This feature only works for devices connected via wi-fi, so presumably that is relevant?

Ari
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    The Google WiFi test only works for Google Mesh devices, where it's built-in. – harrymc Feb 28 '21 at 21:29
  • It works for any device connected via wi-fi to a Google WiFi router. – Ari Mar 01 '21 at 22:11
  • Yes, since it's a Google device. This functionality is most likely built into the wifi chip, perhaps using the fact that wifi client devices verify continuously the router reception quality with a view to finding a better Access Path, so the router has this data. (Just a theory.) – harrymc Mar 02 '21 at 08:54

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