network-manager-config-connectivity-debian - 1.14.6-2+deb10u1 main

This package contains a configuration file which enables NetworkManager's
connectivity checking functionality.
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NetworkManager will try to connect to a Debian server to determine the
connection status.
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This is particularly useful for captive portal detection.
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No user data is transmitted in the connectivity checks, but merely contacting
the Debian connectivity check servers reveals that the user is running a
Debian(-based) operating system with NetworkManager.