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This parameter allows configuring the activation policy for an interface, meaning how it manages the interface's administrative state (IFF_UP flag). The policy can be configured to bring the interface either up or down when the interface is (re)configured, to always force the interface either up or down, or to never change the interface administrative state. If the interface is bound with BindCarrier=, its administrative state is controlled by the interface(s) it's bound to, and this parameter is forced to 'bound'. This changes the default behavior of how systemd-networkd sets the IFF_UP flag; previously, it was set up (if not already up) every time the link_joined() function was called. Now, with the default ActivationPolicy= setting of 'up', it will only set the IFF_UP flag once, the first time link_joined() is called, during an interface's configuration; and on the first link_joined() call each time the interface is reconfigured. Fixes: #3031 Fixes: #17437