systemd-networkd.service, systemd-networkd - Network manager
systemd-networkd is a system service that manages networks. It detects
and configures network devices as they appear, as well as creating
virtual network devices.
To configure low-level link settings independently of networks, see
systemd-networkd will create network devices based on the configuration
in systemd.netdev(5) files, respecting the [Match] sections in those
systemd-networkd will manage network addresses and routes for any link
for which it finds a .network file with an appropriate [Match] section,
see systemd.network(5). For those links, it will flush existing network
addresses and routes when bringing up the device. Any links not matched
by one of the .network files will be ignored. It is also possible to
explicitly tell systemd-networkd to ignore a link by using
Unmanaged=yes option, see systemd.network(5).
When systemd-networkd exits, it generally leaves existing network
devices and configuration intact. This makes it possible to transition
from the initrams and to restart the service without breaking
connectivity. This also means that when configuration is updated and
systemd-networkd is restarted, netdev interfaces for which
configuration was removed will not be dropped, and may need to be
cleaned up manually.
The configuration files are read from the files located in the system
network directory /lib/systemd/network, the volatile runtime network
directory /run/systemd/network and the local administration network
Networks are configured in .network files, see systemd.network(5), and
virtual network devices are configured in .netdev files, see
systemd(1), systemd.link(5), systemd.network(5), systemd.netdev(5),
systemd 237 SYSTEMD-NETWORKD.SERVICE(8)
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