network-manager-config-connectivity-cyclop

This package contains a configuration file which enables NetworkManager's connectivity checking functionality. NetworkManager asks http://connectivity.cyclop-tech.com/check, a server run by Cyclop Technologies, every five minutes and expects an empty HTTP 204 answer. The file is named 99- so that it wins over the Ubuntu connectivity configuration when both are installed. This is particularly useful for captive portal detection. No user data is transmitted in the connectivity checks, but merely contacting the Cyclop OS connectivity check servers reveals that the user is running Cyclop OS with NetworkManager.

sudo apt install network-manager-config-connectivity-cyclop