SYSTEMD.NETWORK(5)systemd.networkSYSTEMD.NETWORK(5)NAMEsystemd.network - Network configuration
SYNOPSIS
network.network
DESCRIPTION
Network setup is performed by systemd-networkd(8).
Network files must have the extension .network; other extensions are
ignored. Networks are applied to links whenever the links appear.
The .network files are read from the files located in the system
network directory /usr/lib/systemd/network, the volatile runtime
network directory /run/systemd/network and the local administration
network directory /etc/systemd/network. All configuration files are
collectively sorted and processed in lexical order, regardless of the
directories in which they live. However, files with identical filenames
replace each other. Files in /etc have the highest priority, files in
/run take precedence over files with the same name in /usr/lib. This
can be used to override a system-supplied configuration file with a
local file if needed; a symlink in /etc with the same name as a
configuration file in /usr/lib, pointing to /dev/null, disables the
configuration file entirely.
The network file contains a "[Match]" section, which determines if a
given network file may be applied to a given device; and a "[Network]"
section specifying how the device should be configured. The first (in
lexical order) of the network files that matches a given device is
applied.
A network file is said to match a device if each of the entries in the
"[Match]" section matches, or if the section is empty. The following
keys are accepted:
MACAddress=
The hardware address.
Path=
The persistent path, as exposed by the udev property "ID_PATH". May
contain shell style globs.
Driver=
The driver currently bound to the device, as exposed by the udev
property "DRIVER" of its parent device, or if that is not set the
driver as exposed by "ethtool -i" of the device itself.
Type=
The device type, as exposed by the udev property "DEVTYPE".
Name=
The device name, as exposed by the udev property "INTERFACE". May
contain shell style globs.
Host=
Matches against the hostname or machine ID of the host. See
"ConditionHost=" in systemd.unit(5) for details.
Virtualization=
Checks whether the system is executed in a virtualized environment
and optionally test whether it is a specific implementation. See
"ConditionVirtualization=" in systemd.unit(5) for details.
KernelCommandLine=
Checks whether a specific kernel command line option is set (or if
prefixed with the exclamation mark unset). See
"ConditionKernelCommandLine=" in systemd.unit(5) for details.
Architecture=
Checks whether the system is running on a specific architecture.
See "ConditionArchitecture=" in systemd.unit(5) for details.
The "[Network]" section accepts the following keys:
Description=
A description of the device. This is only used for presentation
purposes.
DHCP=
A boolean. When true, enables basic DHCPv4 support.
IPv4LL=
A boolean. When true, enables IPv4 link-local support. If "DHCP="
is also true, IPv4 link-local address will be removed upon
acquiring a DHCP lease.
Address=
A static IPv4 or IPv6 address and its prefix length, separated by a
"/" character. Specify this key more than once to configure several
addresses. The format of the address must be as described in
inet_pton(3). This is a short-hand for an [Address] section only
containing an Address key (see below). This option may be specified
more than once.
Gateway=
The gateway address, which must be in the format described in
inet_pton(3). This is a short-hand for a [Route] section only
containing a Gateway key. This option may be specified more than
once.
DNS=
A DNS server address, which must be in the format described in
inet_pton(3). This option may be specified more than once.
Bridge=
The name of the bridge to add the link to.
Bond=
The name of the bond to add the link to.
VLAN=
The name of a VLAN to create on the link. This option may be
specified more than once.
MACVLAN=
The name of a MACVLAN to create on the link. This option may be
specified more than once.
An "[Address]" section accepts the following keys. Specify several
"[Address]" sections to configure several addresses.
Address=
As in the "[Network]" section. This key is mandatory.
Broadcast=
The broadcast address, which must be in the format described in
inet_pton(3) . This key only applies to IPv4 addresses. If it is
not given, it is derived from the "Address" key.
Label=
An address label.
The "[Route]" section accepts the following keys. Specify several
"[Route]" sections to configure several routes.
Gateway=
As in the "[Network]" section. This key is mandatory.
Destination=
The destination prefix of the route. Possibly followed by a slash
and the prefixlength, if ommitted a full-length host route is
assumed.
The "[DHCPv4]" section accepts the following keys:
UseDNS=
When true (the default), the DNS servers received from the DHCP
server will be used and take precedence over any statically
configured ones.
UseMTU=
When true, the interface maximum transmission unit from the DHCP
server will be used on the current link. Defaults to false.
UseHostname=
When true (the default), the hostname received from the DHCP server
will be used as the transient hostname.
CriticalConnection=
When true, the connection will never be torn down even if the DHCP
lease expires. This is contrary to the DHCP specification, but may
be the best choice if, say, the root filesystem relies on this
connection. Defaults to false.
EXAMPLE
Example 1. /etc/systemd/network/50-static.network
[Match]
Name=enp2s0
[Network]
Address=192.168.0.15/24
Gateway=192.168.0.1
Example 2. /etc/systemd/network/80-dhcp.network
[Match]
Name=en*
[Network]
DHCP=yes
Example 3. /etc/systemd/network/bridge-static.network
[Match]
Name=bridge0
[Network]
Address=192.168.0.15/24
Gateway=192.168.0.1
DNS=192.168.0.1
Example 4. /etc/systemd/network/bridge-slave-interface.network
[Match]
Name=enp2s0
[Network]
Bridge=bridge0
SEE ALSOsystemd(1), systemd-networkd(8), systemd.netdev(5)systemd 212SYSTEMD.NETWORK(5)
