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NAME | SYNOPSIS | DESCRIPTION | CONFIGURATION DIRECTORIES AND PRECEDENCE | [NETWORK] SECTION OPTIONS | [DHCP] SECTION OPTIONS | SEE ALSO | NOTES | COLOPHON |
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NETWORKD.CONF(5) networkd.conf NETWORKD.CONF(5)
networkd.conf, networkd.conf.d - Global Network configuration
files
/etc/systemd/networkd.conf
/etc/systemd/networkd.conf.d/*.conf
/usr/lib/systemd/networkd.conf.d/*.conf
These configuration files control global network parameters.
Currently the DHCP Unique Identifier (DUID).
The default configuration is defined during compilation, so a
configuration file is only needed when it is necessary to deviate
from those defaults. By default, the configuration file in
/etc/systemd/ contains commented out entries showing the defaults
as a guide to the administrator. This file can be edited to
create local overrides.
When packages need to customize the configuration, they can
install configuration snippets in /usr/lib/systemd/*.conf.d/ or
/usr/local/lib/systemd/*.conf.d/. The main configuration file is
read before any of the configuration directories, and has the
lowest precedence; entries in a file in any configuration
directory override entries in the single configuration file.
Files in the *.conf.d/ configuration subdirectories are sorted by
their filename in lexicographic order, regardless of in which of
the subdirectories they reside. When multiple files specify the
same option, for options which accept just a single value, the
entry in the file with the lexicographically latest name takes
precedence. For options which accept a list of values, entries
are collected as they occur in files sorted lexicographically.
Files in /etc/ are reserved for the local administrator, who may
use this logic to override the configuration files installed by
vendor packages. It is recommended to prefix all filenames in
those subdirectories with a two-digit number and a dash, to
simplify the ordering of the files.
To disable a configuration file supplied by the vendor, the
recommended way is to place a symlink to /dev/null in the
configuration directory in /etc/, with the same filename as the
vendor configuration file.
The following options are available in the [Network] section:
SpeedMeter=
Takes a boolean. If set to yes, then systemd-networkd
measures the traffic of each interface, and networkctl status
INTERFACE shows the measured speed. Defaults to no.
SpeedMeterIntervalSec=
Specifies the time interval to calculate the traffic speed of
each interface. If SpeedMeter=no, the value is ignored.
Defaults to 10sec.
ManageForeignRoutes=
A boolean. When true, systemd-networkd will store any routes
configured by other tools in its memory. When false,
systemd-networkd will not manage the foreign routes, thus
they are kept even if KeepConfiguration= is false. Defaults
to yes.
This section configures the DHCP Unique Identifier (DUID) value
used by DHCP protocol. DHCPv6 client protocol sends the DHCP
Unique Identifier and the interface Identity Association
Identifier (IAID) to a DHCP server when acquiring a dynamic IPv6
address. DHCPv4 client protocol sends IAID and DUID to the DHCP
server when acquiring a dynamic IPv4 address if
ClientIdentifier=duid. IAID and DUID allows a DHCP server to
uniquely identify the machine and the interface requesting a DHCP
IP. To configure IAID and ClientIdentifier, see
systemd.network(5).
The following options are understood:
DUIDType=
Specifies how the DUID should be generated. See RFC 3315[1]
for a description of all the options.
The following values are understood:
vendor
If "DUIDType=vendor", then the DUID value will be
generated using "43793" as the vendor identifier
(systemd) and hashed contents of machine-id(5). This is
the default if DUIDType= is not specified.
uuid
If "DUIDType=uuid", and DUIDRawData= is not set, then the
product UUID is used as a DUID value. If a system does
not have valid product UUID, then an application-specific
machine-id(5) is used as a DUID value. About the
application-specific machine ID, see
sd_id128_get_machine_app_specific(3).
link-layer-time[:TIME], link-layer
If "link-layer-time" or "link-layer" is specified, then
the MAC address of the interface is used as a DUID value.
The value "link-layer-time" can take additional time
value after a colon, e.g. "link-layer-time:2018-01-23
12:34:56 UTC". The default time value is "2000-01-01
00:00:00 UTC".
In all cases, DUIDRawData= can be used to override the actual
DUID value that is used.
DUIDRawData=
Specifies the DHCP DUID value as a single newline-terminated,
hexadecimal string, with each byte separated by ":". The DUID
that is sent is composed of the DUID type specified by
DUIDType= and the value configured here.
The DUID value specified here overrides the DUID that
systemd-networkd.service(8) generates from the machine ID. To
configure DUID per-network, see systemd.network(5). The
configured DHCP DUID should conform to the specification in
RFC 3315[2], RFC 6355[3]. To configure IAID, see
systemd.network(5).
Example 1. A DUIDType=vendor with a custom value
DUIDType=vendor
DUIDRawData=00:00:ab:11:f9:2a:c2:77:29:f9:5c:00
This specifies a 14 byte DUID, with the type DUID-EN
("00:02"), enterprise number 43793 ("00:00:ab:11"), and
identifier value "f9:2a:c2:77:29:f9:5c:00".
systemd(1), systemd.network(5), systemd-networkd.service(8),
machine-id(5), sd_id128_get_machine_app_specific(3)
1. RFC 3315
https://tools.ietf.org/html/rfc3315#section-9
2. RFC 3315
http://tools.ietf.org/html/rfc3315#section-9
3. RFC 6355
http://tools.ietf.org/html/rfc6355
This page is part of the systemd (systemd system and service
manager) project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have
a bug report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2020-12-18. (At that
time, the date of the most recent commit that was found in the
repository was 2020-12-18.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
systemd 247 NETWORKD.CONF(5)
Pages that refer to this page: systemd.network(5), systemd.directives(7), systemd.index(7)
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