networkd.conf

systemd
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`

## Description

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

## [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.

`ManageForeignRoutingPolicyRules=`

  A boolean. When true, `systemd-networkd` will remove rules that are not configured in .network files (except for rules with protocol `kernel`). When false, it will not remove any foreign rules, keeping them even if they are not configured in a .network file. Defaults to yes.

`ManageForeignRoutes=`

  A boolean. When true, `systemd-networkd` will remove routes that are not configured in .network files (except for routes with protocol `kernel`, `dhcp` when `KeepConfiguration=` is true or `dhcp`, and `static` when `KeepConfiguration=` is true or `static`). When false, it will not remove any foreign routes, keeping them even if they are not configured in a .network file. Defaults to yes.

`RouteTable=`

  Defines the route table name. Takes a whitespace-separated list of the pairs of route table name and number. The route table name and number in each pair are separated with a colon, i.e., `name:number`. The route table name must not be `default`, `main`, or `local`, as these route table names are predefined with route table number 253, 254, and 255, respectively. The route table number must be an integer in the range 1…4294967295. This setting can be specified multiple times. If an empty string is specified, then the list specified earlier are cleared. Defaults to unset.

## [DHCPv4] Section Options

This section configures the DHCP Unique Identifier (DUID) value used by DHCP protocol. 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 address. 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 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, RFC 6355. To configure IAID, see systemd.network 5 .

  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`.

## [DHCPv6] Section Options

This section configures the DHCP Unique Identifier (DUID) value used by DHCPv6 protocol. DHCPv6 client protocol sends the DHCP Unique Identifier and the interface Identity Association Identifier (IAID) to a DHCPv6 server when acquiring a dynamic IPv6 address. IAID and DUID allows a DHCPv6 server to uniquely identify the machine and the interface requesting a DHCP IP address. To configure IAID, see systemd.network 5.

The following options are understood:

`DUIDType=`
`DUIDRawData=`

  As in the [DHCPv4] section.

## See Also

systemd 1, systemd.network 5, systemd-networkd.service 8, machine-id 5, sd_id128_get_machine_app_specific 3