Manual: NetworkManager-wait-online.service

NETWORKMANAGER-WAIT-ONLINE(8)			 Network management daemons		       NETWORKMANAGER-WAIT-ONLINE(8)

NAME
       NetworkManager-wait-online.service - Wait for the network to come online

DESCRIPTION
       The NetworkManager-wait-online service is a oneshot systemd service that delays reaching the network-online target
       until NetworkManager reports that the startup is completed on the D-Bus.

       When the system boots, for example, remote mounts defined in /etc/fstab, require that the network is up. For this,
       these systemd units contain the After=network-online.target setting to order themselves after this target.
       NetworkManager-wait-online ensures that the network-online target is reached only after the network is available.

       Optimally, all services on the host react dynamically to network changes and systemd services do not need to be
       configured to start after reaching the network-online target. In this case, NetworkManager-wait-online.service has no
       effect and does not delay the boot time. On the other hand, if you encounter a long boot time due to the delay of
       NetworkManager-wait-online, investigate the services that require network access and fix them.

       Except for the time out value in the NetworkManager-wait-online.service unit, you cannot configure this service.
       Instead, settings in NetworkManager and the connection profiles affect the behavior:

       •   Startup is not complete as long as NetworkManager profiles are in an activating state. During boot,
	   NetworkManager starts profiles with the connection.autoconnect=yes setting. If activation fails, NetworkManager
	   retries the activation depending on the value of the connection.autoconnect-retries setting.

	   NetworkManager reports startup complete when all profiles and devices are either activated or in a disconnect
	   state and no further events are expected.

       •   When a device reaches the activate state depends on its configuration. For example, with a profile that has both
	   IPv4 and IPv6 enabled, by default, NetworkManager considers the device as fully activated already when only one
	   of the address families is ready.

	   The ipv4.may-fail and ipv6.may-fail settings control this behavior. Additionally, the following settings
	   influence when the two address families complete: ipv4.required-timeout, ipv6.required-timeout,
	   ipv4.dhcp-timeout, and ipv6.ra-timeout. For details, see nm-settings-nmcli(5).

       •   NetworkManager cannot set IP addresses on bridge and bond devices that have ports that do not auto-activate.
	   Because of this configuration error, NetworkManager-wait-online blocks until the service reaches its timeout
	   value.

       •   Dispatcher scripts for the pre-up event run at a late stage during activation of a profile. These scripts block
	   the activation for when NetworkManager considers the profile fully activated. For details, see NetworkManager-
	   dispatcher(8).

       •   The property connection.wait-activation-delay adds an additional delay during activation and delays startup
	   complete. This setting works around certain cases where a device is known to not be ready for a certain amount of
	   time.

       •   The property connection.wait-device-timeout in the connection profiles cause a delay until the waiting devices
	   appear. This is useful if the driver takes a longer time to detect the networking interfaces. This setting is
	   similar to the connection.gateway-ping-timeout property.

       •   With Wi-Fi devices, NetworkManager needs to wait for the first scan result to know which networks are available.
	   That adds a delay.

       •   With Ethernet devices, NetworkManager waits for the carrier until the value in [device*].carrier-wait-timeout is
	   reached. This is because some devices take a long time to detect the carrier. Consequently, booting with cable
	   unplugged, unnecessarily delays NetworkManager-wait-online.service.

BUGS
       Please report any bugs in NetworkManager at the NetworkManager issue tracker[1].

SEE ALSO
       NetworkManager home page[2], NetworkManager(8), nm-online(1), the network-online.target description in
       systemd.special(7)

NOTES
	1. NetworkManager issue tracker
	   https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues

	2. NetworkManager home page
	   https://networkmanager.dev

NetworkManager-wait-online								       NETWORKMANAGER-WAIT-ONLINE(8)