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NETWORKD.CONF(5)                 networkd.conf                NETWORKD.CONF(5)

NAME
       networkd.conf, networkd.conf.d - Global Network configuration files

SYNOPSIS
       /etc/systemd/networkd.conf

       /etc/systemd/networkd.conf.d/*.conf

       /lib/systemd/networkd.conf.d/*.conf

DESCRIPTION
       These configuration files control global network parameters. Currently
       the DHCP Unique Identifier (DUID).

CONFIGURATION DIRECTORIES AND PRECEDENCE
       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.

[NETWORK] SECTION OPTIONS
       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.

[DHCP] SECTION OPTIONS
       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".

SEE ALSO
       systemd(1), systemd.network(5), systemd-networkd.service(8), machine-
       id(5), sd_id128_get_machine_app_specific(3)

NOTES
        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

systemd 245                                                   NETWORKD.CONF(5)

NAME | SYNOPSIS | DESCRIPTION | CONFIGURATION DIRECTORIES AND PRECEDENCE | [NETWORK] SECTION OPTIONS | [DHCP] SECTION OPTIONS | SEE ALSO | NOTES