SYSTEMD.NETDEV(5)

systemd.network

SYSTEMD.NETDEV(5)

NAME¶

systemd.netdev - Virtual Network Device configuration

SYNOPSIS¶

netdev.netdev

DESCRIPTION¶

A plain ini-style text file that encodes configuration about a virtual network device, used by systemd-networkd(8). See systemd.syntax(7) for a general description of the syntax.

The main Virtual Network Device file must have the extension .netdev; other extensions are ignored. Virtual network devices are created as soon as networkd is started. If a netdev with the specified name already exists, networkd will use that as-is rather than create its own. Note that the settings of the pre-existing netdev will not be changed by networkd.

The .netdev files are read from the files located in the system network directory /lib/systemd/network and /usr/local/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 alphanumeric order, regardless of the directories in which they live. However, files with identical filenames replace each other. It is recommended that each filename is prefixed with a number (e.g. 10-vlan.netdev). Otherwise, .netdev files generated by systemd-network-generator.service(8) may take precedence over user configured files. Files in /etc/ have the highest priority, files in /run/ take precedence over files with the same name in /lib/. This can be used to override a system-supplied configuration file with a local file if needed. As a special case, an empty file (file size 0) or symlink with the same name pointing to /dev/null disables the configuration file entirely (it is "masked").

Along with the netdev file foo.netdev, a "drop-in" directory foo.netdev.d/ may exist. All files with the suffix ".conf" from this directory will be merged in the alphanumeric order and parsed after the main file itself has been parsed. This is useful to alter or add configuration settings, without having to modify the main configuration file. Each drop-in file must have appropriate section headers.

In addition to /etc/systemd/network, drop-in ".d" directories can be placed in /lib/systemd/network or /run/systemd/network directories. Drop-in files in /etc/ take precedence over those in /run/ which in turn take precedence over those in /lib/. Drop-in files under any of these directories take precedence over the main netdev file wherever located. (Of course, since /run/ is temporary and /usr/lib/ is for vendors, it is unlikely drop-ins should be used in either of those places.)

SUPPORTED NETDEV KINDS¶

The following kinds of virtual network devices may be configured in .netdev files:

Table 1. Supported kinds of virtual network devices

Kind	Description
bond	A bond device is an aggregation of all its slave devices. See Linux Ethernet Bonding Driver HOWTO[1] for details.
bridge	A bridge device is a software switch, and each of its slave devices and the bridge itself are ports of the switch.
dummy	A dummy device drops all packets sent to it.
gre	A Level 3 GRE tunnel over IPv4. See RFC 2784[2] for details. Name "gre0" should not be used, as the kernel creates a device with this name when the corresponding kernel module is loaded.
gretap	A Level 2 GRE tunnel over IPv4. Name "gretap0" should not be used, as the kernel creates a device with this name when the corresponding kernel module is loaded.
erspan	ERSPAN mirrors traffic on one or more source ports and delivers the mirrored traffic to one or more destination ports on another switch. The traffic is encapsulated in generic routing encapsulation (GRE) and is therefore routable across a layer 3 network between the source switch and the destination switch. Name "erspan0" should not be used, as the kernel creates a device with this name when the corresponding kernel module is loaded.
ip6gre	A Level 3 GRE tunnel over IPv6.
ip6tnl	An IPv4 or IPv6 tunnel over IPv6
ip6gretap	A Level 2 GRE tunnel over IPv6.
ipip	An IPv4 over IPv4 tunnel.
ipvlan	An IPVLAN device is a stacked device which receives packets from its underlying device based on IP address filtering.
ipvtap	An IPVTAP device is a stacked device which receives packets from its underlying device based on IP address filtering and can be accessed using the tap user space interface.
macvlan	A macvlan device is a stacked device which receives packets from its underlying device based on MAC address filtering.
macvtap	A macvtap device is a stacked device which receives packets from its underlying device based on MAC address filtering.
sit	An IPv6 over IPv4 tunnel.
tap	A persistent Level 2 tunnel between a network device and a device node.
tun	A persistent Level 3 tunnel between a network device and a device node.
veth	An Ethernet tunnel between a pair of network devices.
vlan	A VLAN is a stacked device which receives packets from its underlying device based on VLAN tagging. See IEEE 802.1Q[3] for details.
vti	An IPv4 over IPSec tunnel.
vti6	An IPv6 over IPSec tunnel.
vxlan	A virtual extensible LAN (vxlan), for connecting Cloud computing deployments.
geneve	A GEneric NEtwork Virtualization Encapsulation (GENEVE) netdev driver.
l2tp	A Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol used to support virtual private networks (VPNs) or as part of the delivery of services by ISPs. It does not provide any encryption or confidentiality by itself
macsec	Media Access Control Security (MACsec) is an 802.1AE IEEE industry-standard security technology that provides secure communication for all traffic on Ethernet links. MACsec provides point-to-point security on Ethernet links between directly connected nodes and is capable of identifying and preventing most security threats.
vrf	A Virtual Routing and Forwarding (VRF[4]) interface to create separate routing and forwarding domains.
vcan	The virtual CAN driver (vcan). Similar to the network loopback devices, vcan offers a virtual local CAN interface.
vxcan	The virtual CAN tunnel driver (vxcan). Similar to the virtual ethernet driver veth, vxcan implements a local CAN traffic tunnel between two virtual CAN network devices. When creating a vxcan, two vxcan devices are created as pair. When one end receives the packet it appears on its pair and vice versa. The vxcan can be used for cross namespace communication.
wireguard	WireGuard Secure Network Tunnel.
nlmon	A Netlink monitor device. Use an nlmon device when you want to monitor system Netlink messages.
fou	Foo-over-UDP tunneling.
xfrm	A virtual tunnel interface like vti/vti6 but with several advantages.
ifb	The Intermediate Functional Block (ifb) pseudo network interface acts as a QoS concentrator for multiple different sources of traffic.
bareudp	Bare UDP tunnels provide a generic L3 encapsulation support for tunnelling different L3 protocols like MPLS, IP etc. inside of an UDP tunnel.
batadv	B.A.T.M.A.N. Advanced[5] is a routing protocol for multi-hop mobile ad-hoc networks which operates on layer 2.
ipoib	An IP over Infiniband subinterface.
wlan	A virtual wireless network (WLAN) interface.

[MATCH] SECTION OPTIONS¶

A virtual network device is only created if the [Match] section matches the current environment, or if the section is empty. The following keys are accepted:

Host=

Matches against the hostname or machine ID of the host. See ConditionHost= in systemd.unit(5) for details. When prefixed with an exclamation mark ("!"), the result is negated. If an empty string is assigned, the previously assigned value is cleared.

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. When prefixed with an exclamation mark ("!"), the result is negated. If an empty string is assigned, the previously assigned value is cleared.

KernelCommandLine=

Checks whether a specific kernel command line option is set. See ConditionKernelCommandLine= in systemd.unit(5) for details. When prefixed with an exclamation mark ("!"), the result is negated. If an empty string is assigned, the previously assigned value is cleared.

KernelVersion=

Checks whether the kernel version (as reported by uname -r) matches a certain expression. See ConditionKernelVersion= in systemd.unit(5) for details. When prefixed with an exclamation mark ("!"), the result is negated. If an empty string is assigned, the previously assigned value is cleared.

Credential=

Checks whether the specified credential was passed to the systemd-networkd.service service. See System and Service Credentials[6] for details. When prefixed with an exclamation mark ("!"), the result is negated. If an empty string is assigned, the previously assigned value is cleared.

Architecture=

Checks whether the system is running on a specific architecture. See ConditionArchitecture= in systemd.unit(5) for details. When prefixed with an exclamation mark ("!"), the result is negated. If an empty string is assigned, the previously assigned value is cleared.

Firmware=

Checks whether the system is running on a machine with the specified firmware. See ConditionFirmware= in systemd.unit(5) for details. When prefixed with an exclamation mark ("!"), the result is negated. If an empty string is assigned, the previously assigned value is cleared.

[NETDEV] SECTION OPTIONS¶

The [NetDev] section accepts the following keys:

Description=

A free-form description of the netdev.

Name=

The interface name used when creating the netdev. This setting is compulsory.

Kind=

The netdev kind. This setting is compulsory. See the "Supported netdev kinds" section for the valid keys.

MTUBytes=

The maximum transmission unit in bytes to set for the device. The usual suffixes K, M, G are supported and are understood to the base of 1024. For "tun" or "tap" devices, MTUBytes= setting is not currently supported in [NetDev] section. Please specify it in [Link] section of corresponding systemd.network(5) files.

MACAddress=

Specifies the MAC address to use for the device, or takes the special value "none". When "none", systemd-networkd does not request the MAC address for the device, and the kernel will assign a random MAC address. For "tun", "tap", or "l2tp" devices, the MACAddress= setting in the [NetDev] section is not supported and will be ignored. Please specify it in the [Link] section of the corresponding systemd.network(5) file. If this option is not set, "vlan" device inherits the MAC address of the master interface. For other kind of netdevs, if this option is not set, then the MAC address is generated based on the interface name and the machine-id(5).

Note, even if "none" is specified, systemd-udevd will assign the persistent MAC address for the device, as 99-default.link has MACAddressPolicy=persistent. So, it is also necessary to create a custom .link file for the device, if the MAC address assignment is not desired.

[BRIDGE] SECTION OPTIONS¶

The [Bridge] section only applies for netdevs of kind "bridge", and accepts the following keys:

HelloTimeSec=

HelloTimeSec specifies the number of seconds between two hello packets sent out by the root bridge and the designated bridges. Hello packets are used to communicate information about the topology throughout the entire bridged local area network.

MaxAgeSec=

MaxAgeSec specifies the number of seconds of maximum message age. If the last seen (received) hello packet is more than this number of seconds old, the bridge in question will start the takeover procedure in attempt to become the Root Bridge itself.

ForwardDelaySec=

ForwardDelaySec specifies the number of seconds spent in each of the Listening and Learning states before the Forwarding state is entered.

AgeingTimeSec=

This specifies the number of seconds a MAC Address will be kept in the forwarding database after having a packet received from this MAC Address.

Priority=

The priority of the bridge. An integer between 0 and 65535. A lower value means higher priority. The bridge having the lowest priority will be elected as root bridge.

GroupForwardMask=

A 16-bit bitmask represented as an integer which allows forwarding of link local frames with 802.1D reserved addresses (01:80:C2:00:00:0X). A logical AND is performed between the specified bitmask and the exponentiation of 2^X, the lower nibble of the last octet of the MAC address. For example, a value of 8 would allow forwarding of frames addressed to 01:80:C2:00:00:03 (802.1X PAE).

DefaultPVID=

This specifies the default port VLAN ID of a newly attached bridge port. Set this to an integer in the range 1...4094 or "none" to disable the PVID.

MulticastQuerier=

Takes a boolean. This setting controls the IFLA_BR_MCAST_QUERIER option in the kernel. If enabled, the kernel will send general ICMP queries from a zero source address. This feature should allow faster convergence on startup, but it causes some multicast-aware switches to misbehave and disrupt forwarding of multicast packets. When unset, the kernel's default will be used.

MulticastSnooping=

Takes a boolean. This setting controls the IFLA_BR_MCAST_SNOOPING option in the kernel. If enabled, IGMP snooping monitors the Internet Group Management Protocol (IGMP) traffic between hosts and multicast routers. When unset, the kernel's default will be used.

VLANFiltering=

Takes a boolean. This setting controls the IFLA_BR_VLAN_FILTERING option in the kernel. If enabled, the bridge will be started in VLAN-filtering mode. When unset, the kernel's default will be used.

VLANProtocol=

Allows setting the protocol used for VLAN filtering. Takes 802.1q or, 802.1ad, and defaults to unset and kernel's default is used.

STP=

Takes a boolean. This enables the bridge's Spanning Tree Protocol (STP). When unset, the kernel's default will be used.

MulticastIGMPVersion=

Allows changing bridge's multicast Internet Group Management Protocol (IGMP) version. Takes an integer 2 or 3. When unset, the kernel's default will be used.

[VLAN] SECTION OPTIONS¶

The [VLAN] section only applies for netdevs of kind "vlan", and accepts the following key:

Id=

The VLAN ID to use. An integer in the range 0...4094. This setting is compulsory.

Protocol=

Allows setting the protocol used for the VLAN interface. Takes "802.1q" or, "802.1ad", and defaults to unset and kernel's default is used.

GVRP=

Takes a boolean. The Generic VLAN Registration Protocol (GVRP) is a protocol that allows automatic learning of VLANs on a network. When unset, the kernel's default will be used.

MVRP=

Takes a boolean. Multiple VLAN Registration Protocol (MVRP) formerly known as GARP VLAN Registration Protocol (GVRP) is a standards-based Layer 2 network protocol, for automatic configuration of VLAN information on switches. It was defined in the 802.1ak amendment to 802.1Q-2005. When unset, the kernel's default will be used.

LooseBinding=

Takes a boolean. The VLAN loose binding mode, in which only the operational state is passed from the parent to the associated VLANs, but the VLAN device state is not changed. When unset, the kernel's default will be used.

ReorderHeader=

Takes a boolean. When enabled, the VLAN reorder header is used and VLAN interfaces behave like physical interfaces. When unset, the kernel's default will be used.

EgressQOSMaps=, IngressQOSMaps=

Defines a mapping of Linux internal packet priority (SO_PRIORITY) to VLAN header PCP field for outgoing and incoming frames, respectively. Takes a whitespace-separated list of integer pairs, where each integer must be in the range 1...4294967294, in the format "from"-"to", e.g., "21-7 45-5". Note that "from" must be greater than or equal to "to". When unset, the kernel's default will be used.

[MACVLAN] SECTION OPTIONS¶

The [MACVLAN] section only applies for netdevs of kind "macvlan", and accepts the following key:

Mode=

The MACVLAN mode to use. The supported options are "private", "vepa", "bridge", "passthru", and "source".

SourceMACAddress=

A whitespace-separated list of remote hardware addresses allowed on the MACVLAN. This option only has an effect in source mode. Use full colon-, hyphen- or dot-delimited hexadecimal. This option may appear more than once, in which case the lists are merged. If the empty string is assigned to this option, the list of hardware addresses defined prior to this is reset. Defaults to unset.

BroadcastMulticastQueueLength=

Specifies the length of the receive queue for broadcast/multicast packets. An unsigned integer in the range 0...4294967294. Defaults to unset.

[MACVTAP] SECTION OPTIONS¶

The [MACVTAP] section applies for netdevs of kind "macvtap" and accepts the same keys as [MACVLAN].

[IPVLAN] SECTION OPTIONS¶

The [IPVLAN] section only applies for netdevs of kind "ipvlan", and accepts the following key:

Mode=

The IPVLAN mode to use. The supported options are "L2","L3" and "L3S".

Flags=

The IPVLAN flags to use. The supported options are "bridge","private" and "vepa".

[IPVTAP] SECTION OPTIONS¶

The [IPVTAP] section only applies for netdevs of kind "ipvtap" and accepts the same keys as [IPVLAN].

[VXLAN] SECTION OPTIONS¶

The [VXLAN] section only applies for netdevs of kind "vxlan", and accepts the following keys:

VNI=

The VXLAN Network Identifier (or VXLAN Segment ID). Takes a number in the range 1...16777215.

Remote=

Configures destination IP address.

Local=

Configures local IP address. It must be an address on the underlying interface of the VXLAN interface, or one of the special values "ipv4_link_local", "ipv6_link_local", "dhcp4", "dhcp6", and "slaac". If one of the special values is specified, an address which matches the corresponding type on the underlying interface will be used. Defaults to unset.

Group=

Configures VXLAN multicast group IP address. All members of a VXLAN must use the same multicast group address.

TOS=

The Type Of Service byte value for a vxlan interface.

TTL=

A fixed Time To Live N on Virtual eXtensible Local Area Network packets. Takes "inherit" or a number in the range 0...255. 0 is a special value meaning inherit the inner protocol's TTL value. "inherit" means that it will inherit the outer protocol's TTL value.

MacLearning=

Takes a boolean. When true, enables dynamic MAC learning to discover remote MAC addresses.

FDBAgeingSec=

The lifetime of Forwarding Database entry learnt by the kernel, in seconds.

MaximumFDBEntries=

Configures maximum number of FDB entries.

ReduceARPProxy=

Takes a boolean. When true, bridge-connected VXLAN tunnel endpoint answers ARP requests from the local bridge on behalf of remote Distributed Overlay Virtual Ethernet (DOVE)[7] clients. Defaults to false.

L2MissNotification=

Takes a boolean. When true, enables netlink LLADDR miss notifications.

L3MissNotification=

Takes a boolean. When true, enables netlink IP address miss notifications.

RouteShortCircuit=

Takes a boolean. When true, route short circuiting is turned on.

UDPChecksum=

Takes a boolean. When true, transmitting UDP checksums when doing VXLAN/IPv4 is turned on.

UDP6ZeroChecksumTx=

Takes a boolean. When true, sending zero checksums in VXLAN/IPv6 is turned on.

UDP6ZeroChecksumRx=

Takes a boolean. When true, receiving zero checksums in VXLAN/IPv6 is turned on.

RemoteChecksumTx=

Takes a boolean. When true, remote transmit checksum offload of VXLAN is turned on.

RemoteChecksumRx=

Takes a boolean. When true, remote receive checksum offload in VXLAN is turned on.

GroupPolicyExtension=

Takes a boolean. When true, it enables Group Policy VXLAN extension security label mechanism across network peers based on VXLAN. For details about the Group Policy VXLAN, see the VXLAN Group Policy[8] document. Defaults to false.

GenericProtocolExtension=

Takes a boolean. When true, Generic Protocol Extension extends the existing VXLAN protocol to provide protocol typing, OAM, and versioning capabilities. For details about the VXLAN GPE Header, see the Generic Protocol Extension for VXLAN[9] document. If destination port is not specified and Generic Protocol Extension is set then default port of 4790 is used. Defaults to false.

DestinationPort=

Configures the default destination UDP port. If the destination port is not specified then Linux kernel default will be used. Set to 4789 to get the IANA assigned value.

PortRange=

Configures the source port range for the VXLAN. The kernel assigns the source UDP port based on the flow to help the receiver to do load balancing. When this option is not set, the normal range of local UDP ports is used.

FlowLabel=

Specifies the flow label to use in outgoing packets. The valid range is 0-1048575.

IPDoNotFragment=

Allows setting the IPv4 Do not Fragment (DF) bit in outgoing packets, or to inherit its value from the IPv4 inner header. Takes a boolean value, or "inherit". Set to "inherit" if the encapsulated protocol is IPv6. When unset, the kernel's default will be used.

Independent=

Takes a boolean. When true, the vxlan interface is created without any underlying network interface. Defaults to false, which means that a .network file that requests this VXLAN interface using VXLAN= is required for the VXLAN to be created.

[GENEVE] SECTION OPTIONS¶

The [GENEVE] section only applies for netdevs of kind "geneve", and accepts the following keys:

Id=

Specifies the Virtual Network Identifier (VNI) to use, a number between 0 and 16777215. This field is mandatory.

Remote=

Specifies the unicast destination IP address to use in outgoing packets.

TOS=

Specifies the TOS value to use in outgoing packets. Takes a number between 1 and 255.

TTL=

Accepts the same values as in the [VXLAN] section, except that when unset or set to 0, the kernel's default will be used, meaning that packet TTL will be set from /proc/sys/net/ipv4/ip_default_ttl.

UDPChecksum=

Takes a boolean. When true, specifies that UDP checksum is calculated for transmitted packets over IPv4.

UDP6ZeroChecksumTx=

Takes a boolean. When true, skip UDP checksum calculation for transmitted packets over IPv6.

UDP6ZeroChecksumRx=

Takes a boolean. When true, allows incoming UDP packets over IPv6 with zero checksum field.

DestinationPort=

Specifies destination port. Defaults to 6081. If not set or assigned the empty string, the default port of 6081 is used.

FlowLabel=

Specifies the flow label to use in outgoing packets.

IPDoNotFragment=

Accepts the same key as in [VXLAN] section.

[BAREUDP] SECTION OPTIONS¶

The [BareUDP] section only applies for netdevs of kind "bareudp", and accepts the following keys:

DestinationPort=

Specifies the destination UDP port (in range 1...65535). This is mandatory.

EtherType=

Specifies the L3 protocol. Takes one of "ipv4", "ipv6", "mpls-uc" or "mpls-mc". This is mandatory.

[L2TP] SECTION OPTIONS¶

The [L2TP] section only applies for netdevs of kind "l2tp", and accepts the following keys:

TunnelId=

Specifies the tunnel identifier. Takes an number in the range 1...4294967295. The value used must match the "PeerTunnelId=" value being used at the peer. This setting is compulsory.

PeerTunnelId=

Specifies the peer tunnel id. Takes a number in the range 1...4294967295. The value used must match the "TunnelId=" value being used at the peer. This setting is compulsory.

Remote=

Specifies the IP address of the remote peer. This setting is compulsory.

Local=

Specifies the IP address of a local interface. Takes an IP address, or the special values "auto", "static", or "dynamic". Optionally a name of a local interface can be specified after "@", e.g. "192.168.0.1@eth0" or "auto@eth0". When an address is specified, then a local or specified interface must have the address, and the remote address must be accessible through the local address. If "auto", then one of the addresses on a local or specified interface which is accessible to the remote address will be used. Similarly, if "static" or "dynamic" is set, then one of the static or dynamic addresses will be used. Defaults to "auto".

EncapsulationType=

Specifies the encapsulation type of the tunnel. Takes one of "udp" or "ip".

UDPSourcePort=

Specifies the UDP source port to be used for the tunnel. When UDP encapsulation is selected it's mandatory. Ignored when IP encapsulation is selected.

UDPDestinationPort=

Specifies destination port. When UDP encapsulation is selected it's mandatory. Ignored when IP encapsulation is selected.

UDPChecksum=

Takes a boolean. When true, specifies that UDP checksum is calculated for transmitted packets over IPv4.

UDP6ZeroChecksumTx=

Takes a boolean. When true, skip UDP checksum calculation for transmitted packets over IPv6.

UDP6ZeroChecksumRx=

Takes a boolean. When true, allows incoming UDP packets over IPv6 with zero checksum field.

[L2TPSESSION] SECTION OPTIONS¶

The [L2TPSession] section only applies for netdevs of kind "l2tp", and accepts the following keys:

Name=

Specifies the name of the session. This setting is compulsory.

SessionId=

Specifies the session identifier. Takes an number in the range 1...4294967295. The value used must match the "SessionId=" value being used at the peer. This setting is compulsory.

PeerSessionId=

Specifies the peer session identifier. Takes an number in the range 1...4294967295. The value used must match the "PeerSessionId=" value being used at the peer. This setting is compulsory.

Layer2SpecificHeader=

Specifies layer2specific header type of the session. One of "none" or "default". Defaults to "default".

[MACSEC] SECTION OPTIONS¶

The [MACsec] section only applies for network devices of kind "macsec", and accepts the following keys:

Port=

Specifies the port to be used for the MACsec transmit channel. The port is used to make secure channel identifier (SCI). Takes a value between 1 and 65535. Defaults to unset.

Encrypt=

Takes a boolean. When true, enable encryption. Defaults to unset.

[MACSECRECEIVECHANNEL] SECTION OPTIONS¶

The [MACsecReceiveChannel] section only applies for network devices of kind "macsec", and accepts the following keys:

Port=

Specifies the port to be used for the MACsec receive channel. The port is used to make secure channel identifier (SCI). Takes a value between 1 and 65535. This option is compulsory, and is not set by default.

MACAddress=

Specifies the MAC address to be used for the MACsec receive channel. The MAC address used to make secure channel identifier (SCI). This setting is compulsory, and is not set by default.

[MACSECTRANSMITASSOCIATION] SECTION OPTIONS¶

The [MACsecTransmitAssociation] section only applies for network devices of kind "macsec", and accepts the following keys:

PacketNumber=

Specifies the packet number to be used for replay protection and the construction of the initialization vector (along with the secure channel identifier [SCI]). Takes a value between 1-4,294,967,295. Defaults to unset.

KeyId=

Specifies the identification for the key. Takes a number between 0-255. This option is compulsory, and is not set by default.

Key=

Specifies the encryption key used in the transmission channel. The same key must be configured on the peer’s matching receive channel. This setting is compulsory, and is not set by default. Takes a 128-bit key encoded in a hexadecimal string, for example "dffafc8d7b9a43d5b9a3dfbbf6a30c16".

KeyFile=

Takes an absolute path to a file which contains a 128-bit key encoded in a hexadecimal string, which will be used in the transmission channel. When this option is specified, Key= is ignored. Note that the file must be readable by the user "systemd-network", so it should be, e.g., owned by "root:systemd-network" with a "0640" file mode. If the path refers to an AF_UNIX stream socket in the file system a connection is made to it and the key read from it.

Activate=

Takes a boolean. If enabled, then the security association is activated. Defaults to unset.

UseForEncoding=

Takes a boolean. If enabled, then the security association is used for encoding. Only one [MACsecTransmitAssociation] section can enable this option. When enabled, Activate=yes is implied. Defaults to unset.

[MACSECRECEIVEASSOCIATION] SECTION OPTIONS¶

The [MACsecReceiveAssociation] section only applies for network devices of kind "macsec", and accepts the following keys:

Port=

Accepts the same key as in [MACsecReceiveChannel] section.

MACAddress=

Accepts the same key as in [MACsecReceiveChannel] section.

PacketNumber=