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NAME | SYNOPSIS | DESCRIPTION | CONFIGURATION DIRECTORIES AND PRECEDENCE | [DHCP] SECTION OPTIONS | SEE ALSO | NOTES | COLOPHON |
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/. Files in /etc/
are reserved for the local administrator, who may use this logic to
override the configuration files installed by vendor packages. 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 which of the
subdirectories they reside in. If multiple files specify the same
option, the entry in the file with the lexicographically latest name
takes precedence. 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.
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.
link-layer-time, link-layer, uuid
Those values are parsed and can be used to set the DUID type
field, but DUID contents must be provided using DUIDRawData=.
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 generates using the machine-id from the
/etc/machine-id file. 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), machine-id(1)
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 2017-07-05. If you dis‐
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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 234 NETWORKD.CONF(5)
Pages that refer to this page: systemd.network(5), systemd.directives(7), systemd.index(7)