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A comment on I stayed in a hotel with Android lightswitches and it was as bad as you'd think. Parent comment

Re:I stayed in a hotel with Android lightswitches and it was... by pgeorgi on Friday March 11, 2016 @03:28PM (#11269261)
Chrome OS tries to honor various DHCP server flags that state that the connection is metered. Unfortunately iOS doesn't seem to provide any such indication.

A comment in https://bugs.chromium.org/p/chromium/issues/detail?id=323010 claims that the BSSID is used for a "suspected" state, but that may not be enough to actually stop it from downloading updates, but I'm far from an expert in that domain.

In short, identifying tethering states with iOS seems to be hard.

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Re:I stayed in a hotel with Android lightswitches and it was... by rdancer on Saturday March 12, 2016 @05:16PM (#11274886)
You can determine whether the network is a Personal Hotspot heuristically. It is nice of them to have implemented private DHCP flags in Android, but if you routinely pull hundreds of megabytes without user interaction...
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