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MacOS seems to assume a WLAN connection to be free of charge if and only if it is not a tethered iPhone connection. So it will run all background update and maintenance processes via that WLAN connection. As my WLAN is in fact a small box with LTE access (payed by volume) I would like to configure the connection as if it were a tethered mobile connection, which it really is.

The answers to the similiar question Managing Metered Connections on OSX all recommend some third party tools, how can I solve it solely with built-in functionality and tools (macOS Sierra, if it helps)?

marked as duplicate by bmike Oct 8 '17 at 13:19

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It appears that you cannot without a third party extension.

In this question: How does iOS and OS X detect when a Wi-Fi network is a personal hotspot?

There is an answer that describes how OS X detects whether the connection is a personal hotspot and it seems that there is some meta data that's embedded within the signal that identifies it as a hotspot or not. (There's even some code that checks for if it's a carplay device, too)

Apple controls the Hardware, the Drivers and the Operating System, I guess they can easily add extra metadata when broadcasting the WiFi signal so your Mac knows to whether adding the chain icon or not.

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