1 <?xml version='
1.0'
?> <!--*-nxml-*-->
2 <!DOCTYPE refentry PUBLIC
"-//OASIS//DTD DocBook XML V4.2//EN"
3 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
6 This file is part of systemd.
8 Copyright 2013 Tom Gundersen
10 systemd is free software; you can redistribute it and/or modify it
11 under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 2.1 of the License, or
13 (at your option) any later version.
15 systemd is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 <refentry id=
"systemd.netdev" conditional='ENABLE_NETWORKD'
>
27 <title>systemd.network
</title>
28 <productname>systemd
</productname>
32 <contrib>Developer
</contrib>
33 <firstname>Tom
</firstname>
34 <surname>Gundersen
</surname>
35 <email>teg@jklm.no
</email>
41 <refentrytitle>systemd.netdev
</refentrytitle>
42 <manvolnum>5</manvolnum>
46 <refname>systemd.netdev
</refname>
47 <refpurpose>Virtual Network Device configuration
</refpurpose>
51 <para><filename><replaceable>netdev
</replaceable>.netdev
</filename></para>
55 <title>Description
</title>
57 <para>Network setup is performed by
58 <citerefentry><refentrytitle>systemd-networkd
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
61 <para>Virtual Network Device files must have the extension
62 <filename>.netdev
</filename>; other extensions are ignored.
63 Virtual network devices are created as soon as networkd is
64 started. If a netdev with the specified name already exists,
65 networkd will use that as-is rather than create its own. Note that
66 the settings of the pre-existing netdev will not be changed by
69 <para>The
<filename>.netdev
</filename> files are read from the
70 files located in the system network directory
71 <filename>/usr/lib/systemd/network
</filename>, the volatile
72 runtime network directory
73 <filename>/run/systemd/network
</filename> and the local
74 administration network directory
75 <filename>/etc/systemd/network
</filename>. All configuration files
76 are collectively sorted and processed in lexical order, regardless
77 of the directories in which they live. However, files with
78 identical filenames replace each other. Files in
79 <filename>/etc
</filename> have the highest priority, files in
80 <filename>/run
</filename> take precedence over files with the same
81 name in
<filename>/usr/lib
</filename>. This can be used to
82 override a system-supplied configuration file with a local file if
83 needed. As a special case, an empty file (file size
0) or symlink
84 with the same name pointing to
<filename>/dev/null
</filename>,
85 disable the configuration file entirely (it is
"masked").
</para>
89 <title>Supported netdev kinds
</title>
91 <para>The following kinds of virtual network devices may be
92 configured in
<filename>.netdev
</filename> files:
</para>
95 <title>Supported kinds of virtual network devices
</title>
98 <colspec colname='kind'
/>
99 <colspec colname='explanation'
/>
102 <entry>Description
</entry>
105 <row><entry><varname>bond
</varname></entry>
106 <entry>A bond device is an aggregation of all its slave devices. See
<ulink url=
"https://www.kernel.org/doc/Documentation/networking/bonding.txt">Linux Ethernet Bonding Driver HOWTO
</ulink> for details.Local configuration
</entry></row>
108 <row><entry><varname>bridge
</varname></entry>
109 <entry>A bridge device is a software switch, each of its slave devices and the bridge itself are ports of the switch.
</entry></row>
111 <row><entry><varname>dummy
</varname></entry>
112 <entry>A dummy device drops all packets sent to it.
</entry></row>
114 <row><entry><varname>gre
</varname></entry>
115 <entry>A Level
3 GRE tunnel over IPv4. See
<ulink url=
"https://tools.ietf.org/html/rfc2784">RFC
2784</ulink> for details.
</entry></row>
117 <row><entry><varname>gretap
</varname></entry>
118 <entry>A Level
2 GRE tunnel over IPv4.
</entry></row>
120 <row><entry><varname>ip6gre
</varname></entry>
121 <entry>A Level
3 GRE tunnel over IPv6.
</entry></row>
123 <row><entry><varname>ip6tnl
</varname></entry>
124 <entry>An IPv4 or IPv6 tunnel over IPv6
</entry></row>
126 <row><entry><varname>ip6gretap
</varname></entry>
127 <entry>An Level
2 GRE tunnel over IPv6.
</entry></row>
129 <row><entry><varname>ipip
</varname></entry>
130 <entry>An IPv4 over IPv4 tunnel.
</entry></row>
132 <row><entry><varname>ipvlan
</varname></entry>
133 <entry>An ipvlan device is a stacked device which receives packets from its underlying device based on IP address filtering.
</entry></row>
135 <row><entry><varname>macvlan
</varname></entry>
136 <entry>A macvlan device is a stacked device which receives packets from its underlying device based on MAC address filtering.
</entry></row>
138 <row><entry><varname>macvtap
</varname></entry>
139 <entry>A macvtap device is a stacked device which receives packets from its underlying device based on MAC address filtering.
</entry></row>
141 <row><entry><varname>sit
</varname></entry>
142 <entry>An IPv6 over IPv4 tunnel.
</entry></row>
144 <row><entry><varname>tap
</varname></entry>
145 <entry>A persistent Level
2 tunnel between a network device and a device node.
</entry></row>
147 <row><entry><varname>tun
</varname></entry>
148 <entry>A persistent Level
3 tunnel between a network device and a device node.
</entry></row>
150 <row><entry><varname>veth
</varname></entry>
151 <entry>An ethernet tunnel between a pair of network devices.
</entry></row>
153 <row><entry><varname>vlan
</varname></entry>
154 <entry>A VLAN is a stacked device which receives packets from its underlying device based on VLAN tagging. See
<ulink url=
"http://www.ieee802.org/1/pages/802.1Q.html">IEEE
802.1Q
</ulink> for details.
</entry></row>
156 <row><entry><varname>vti
</varname></entry>
157 <entry>An IPv4 over IPSec tunnel.
</entry></row>
159 <row><entry><varname>vti6
</varname></entry>
160 <entry>An IPv6 over IPSec tunnel.
</entry></row>
162 <row><entry><varname>vxlan
</varname></entry>
163 <entry>A virtual extensible LAN (vxlan), for connecting Cloud computing deployments.
</entry></row>
171 <title>[Match] Section Options
</title>
173 <para>A virtual network device is only created if the
174 <literal>[Match]
</literal> section matches the current
175 environment, or if the section is empty. The following keys are
178 <variablelist class='network-directives'
>
180 <term><varname>Host=
</varname></term>
182 <para>Matches against the hostname or machine ID of the
183 host. See
<literal>ConditionHost=
</literal> in
184 <citerefentry><refentrytitle>systemd.unit
</refentrytitle><manvolnum>5</manvolnum></citerefentry>
190 <term><varname>Virtualization=
</varname></term>
192 <para>Checks whether the system is executed in a virtualized
193 environment and optionally test whether it is a specific
195 <literal>ConditionVirtualization=
</literal> in
196 <citerefentry><refentrytitle>systemd.unit
</refentrytitle><manvolnum>5</manvolnum></citerefentry>
202 <term><varname>KernelCommandLine=
</varname></term>
204 <para>Checks whether a specific kernel command line option
205 is set (or if prefixed with the exclamation mark unset). See
206 <literal>ConditionKernelCommandLine=
</literal> in
207 <citerefentry><refentrytitle>systemd.unit
</refentrytitle><manvolnum>5</manvolnum></citerefentry>
213 <term><varname>Architecture=
</varname></term>
215 <para>Checks whether the system is running on a specific
216 architecture. See
<literal>ConditionArchitecture=
</literal> in
217 <citerefentry><refentrytitle>systemd.unit
</refentrytitle><manvolnum>5</manvolnum></citerefentry>
227 <title>[NetDev] Section Options
</title>
229 <para>The
<literal>[NetDev]
</literal> section accepts the
230 following keys:
</para>
232 <variablelist class='network-directives'
>
234 <term><varname>Description=
</varname></term>
236 <para>A free-form description of the netdev.
</para>
240 <term><varname>Name=
</varname></term>
242 <para>The interface name used when creating the netdev.
243 This option is compulsory.
</para>
247 <term><varname>Kind=
</varname></term>
249 <para>The netdev kind. This option is compulsory. See the
250 <literal>Supported netdev kinds
</literal> section for the
255 <term><varname>MTUBytes=
</varname></term>
257 <para>The maximum transmission unit in bytes to set for
258 the device. The usual suffixes K, M, G, are supported and
259 are understood to the base of
1024. This key is not
260 currently supported for
<literal>tun
</literal> or
261 <literal>tap
</literal> devices.
266 <term><varname>MACAddress=
</varname></term>
268 <para>The MAC address to use for the device. If none is
269 given, one is generated based on the interface name and
271 <citerefentry><refentrytitle>machine-id
</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
272 This key is not currently supported for
273 <literal>tun
</literal> or
<literal>tap
</literal> devices.
281 <title>[VLAN] Section Options
</title>
283 <para>The
<literal>[VLAN]
</literal> section only applies for
284 netdevs of kind
<literal>vlan
</literal>, and accepts the
285 following key:
</para>
287 <variablelist class='network-directives'
>
289 <term><varname>Id=
</varname></term>
291 <para>The VLAN ID to use. An integer in the range
0–
4094.
292 This option is compulsory.
</para>
300 <title>[MACVLAN] Section Options
</title>
302 <para>The
<literal>[MACVLAN]
</literal> section only applies for
303 netdevs of kind
<literal>macvlan
</literal>, and accepts the
304 following key:
</para>
306 <variablelist class='network-directives'
>
308 <term><varname>Mode=
</varname></term>
310 <para>The MACVLAN mode to use. The supported options are
311 <literal>private
</literal>,
312 <literal>vepa
</literal>,
313 <literal>bridge
</literal>, and
314 <literal>passthru
</literal>.
323 <title>[MACVTAP] Section Options
</title>
325 <para>The
<literal>[MACVTAP]
</literal> section applies for
326 netdevs of kind
<literal>macvtap
</literal> and accepts the
327 same key as
<literal>[MACVLAN].
</literal> </para>
332 <title>[IPVLAN] Section Options
</title>
334 <para>The
<literal>[IPVLAN]
</literal> section only applies for
335 netdevs of kind
<literal>ipvlan
</literal>, and accepts the
336 following key:
</para>
338 <variablelist class='network-directives'
>
340 <term><varname>Mode=
</varname></term>
342 <para>The IPVLAN mode to use. The supported options are
343 <literal>L2
</literal> and
<literal>L3
</literal>.
352 <title>[VXLAN] Section Options
</title>
353 <para>The
<literal>[VXLAN]
</literal> section only applies for
354 netdevs of kind
<literal>vxlan
</literal>, and accepts the
355 following keys:
</para>
357 <variablelist class='network-directives'
>
359 <term><varname>Id=
</varname></term>
361 <para>The VXLAN ID to use.
</para>
365 <term><varname>Group=
</varname></term>
367 <para>An assigned multicast group IP address.
</para>
371 <term><varname>TOS=
</varname></term>
373 <para>The Type Of Service byte value for a vxlan interface.
</para>
377 <term><varname>TTL=
</varname></term>
379 <para>A fixed Time To Live N on Virtual eXtensible Local
380 Area Network packets. N is a number in the range
1-
255.
0
381 is a special value meaning that packets inherit the TTL
386 <term><varname>MacLearning=
</varname></term>
388 <para>A boolean. When true, enables dynamic MAC learning
389 to discover remote MAC addresses.
</para>
393 <term><varname>FDBAgeingSec=
</varname></term>
395 <para>The lifetime of Forwarding Database entry learnt by
396 the kernel in seconds.
</para>
400 <term><varname>ARPProxy=
</varname></term>
402 <para>A boolean. When true, enables ARP proxy.
</para>
406 <term><varname>L2MissNotification=
</varname></term>
408 <para>A boolean. When true, enables netlink LLADDR miss
409 notifications.
</para>
413 <term><varname>L3MissNotification=
</varname></term>
415 <para>A boolean. When true, enables netlink IP ADDR miss
416 notifications.
</para>
420 <term><varname>RouteShortCircuit=
</varname></term>
422 <para>A boolean. When true route short circuit is turned
427 <term><varname>UDPCheckSum=
</varname></term>
429 <para>A boolean. When true transmitting UDP checksums when doing VXLAN/IPv4 is turned on.
</para>
433 <term><varname>UDP6ZeroChecksumTx=
</varname></term>
435 <para>A boolean. When true sending zero checksums in VXLAN/IPv6 is turned on.
</para>
439 <term><varname>UDP6ZeroCheckSumRx=
</varname></term>
441 <para>A boolean. When true receiving zero checksums in VXLAN/IPv6 is turned on.
</para>
445 <term><varname>GroupPolicyExtension=
</varname></term>
447 <para>A boolean. When true it enables Group Policy VXLAN extension security label mechanism
448 across network peers based on VXLAN. For details about the Group Policy VXLAN see the
449 <ulink url=
"https://tools.ietf.org/html/draft-smith-vxlan-group-policy">
450 VXLAN Group Policy
</ulink> document. Defaults to false.
</para>
456 <title>[Tunnel] Section Options
</title>
458 <para>The
<literal>[Tunnel]
</literal> section only applies for
460 <literal>ipip
</literal>,
461 <literal>sit
</literal>,
462 <literal>gre
</literal>,
463 <literal>gretap
</literal>,
464 <literal>ip6gre
</literal>,
465 <literal>ip6gretap
</literal>,
466 <literal>vti
</literal>,
467 <literal>vti6
</literal>, and
468 <literal>ip6tnl
</literal> and accepts
469 the following keys:
</para>
471 <variablelist class='network-directives'
>
473 <term><varname>Local=
</varname></term>
475 <para>A static local address for tunneled packets. It must
476 be an address on another interface of this host.
</para>
480 <term><varname>Remote=
</varname></term>
482 <para>The remote endpoint of the tunnel.
</para>
486 <term><varname>TOS=
</varname></term>
488 <para>The Type Of Service byte value for a tunnel interface.
489 For details about the TOS see the
490 <ulink url=
"http://tools.ietf.org/html/rfc1349"> Type of
491 Service in the Internet Protocol Suite
</ulink> document.
496 <term><varname>TTL=
</varname></term>
498 <para>A fixed Time To Live N on tunneled packets. N is a
499 number in the range
1-
255.
0 is a special value meaning that
500 packets inherit the TTL value. The default value for IPv4
501 tunnels is: inherit. The default value for IPv6 tunnels is:
506 <term><varname>DiscoverPathMTU=
</varname></term>
508 <para>A boolean. When true, enables Path MTU Discovery on
513 <term><varname>IPv6FlowLabel=
</varname></term>
515 <para>Configures The
20-bit Flow Label (see
<ulink url=
"https://tools.ietf.org/html/rfc6437">
516 RFC
6437</ulink>) field in the IPv6 header (see
<ulink url=
"https://tools.ietf.org/html/rfc2460">
517 RFC
2460</ulink>), is used by a node to label packets of a flow.
518 It's only used for IPv6 Tunnels.
519 A Flow Label of zero is used to indicate packets that have
520 not been labeled. Takes following values.
521 When
<literal>inherit
</literal> it uses the original flowlabel,
522 or can be configured to any value between
0 to
0xFFFFF.
</para>
526 <term><varname>CopyDSCP=
</varname></term>
528 <para>A boolean. When true, the Differentiated Service Code
529 Point (DSCP) field will be copied to the inner header from
530 outer header during the decapsulation of an IPv6 tunnel
531 packet. DSCP is a field in an IP packet that enables different
532 levels of service to be assigned to network traffic.
533 Defaults to
<literal>no
</literal>.
538 <term><varname>EncapsulationLimit=
</varname></term>
540 <para>The Tunnel Encapsulation Limit option specifies how many additional
541 levels of encapsulation are permitted to be prepended to the packet.
542 For example, a Tunnel Encapsulation Limit option containing a limit
543 value of zero means that a packet carrying that option may not enter
544 another tunnel before exiting the current tunnel.
545 (see
<ulink url=
"https://tools.ietf.org/html/rfc2473#section-4.1.1"> RFC
2473</ulink>).
546 The valid range is
0-
255 and
<literal>none
</literal>. Defaults to
4.
551 <term><varname>Mode=
</varname></term>
553 <para>An
<literal>ip6tnl
</literal> tunnels can have three
555 <literal>ip6ip6
</literal> for IPv6 over IPv6,
556 <literal>ipip6
</literal> for IPv4 over IPv6 or
557 <literal>any
</literal> for either.
564 <title>[Peer] Section Options
</title>
566 <para>The
<literal>[Peer]
</literal> section only applies for
567 netdevs of kind
<literal>veth
</literal> and accepts the
568 following key:
</para>
570 <variablelist class='network-directives'
>
572 <term><varname>Name=
</varname></term>
574 <para>The interface name used when creating the netdev.
575 This option is compulsory.
</para>
579 <term><varname>MACAddress=
</varname></term>
581 <para>The peer MACAddress, if not set it is generated in
582 the same way as the MAC address of the main
589 <title>[Tun] Section Options
</title>
591 <para>The
<literal>[Tun]
</literal> section only applies for
592 netdevs of kind
<literal>tun
</literal>, and accepts the following
595 <variablelist class='network-directives'
>
597 <term><varname>OneQueue=
</varname></term>
598 <listitem><para>Takes a boolean argument. Configures whether
599 all packets are queued at the device (enabled), or a fixed
600 number of packets are queued at the device and the rest at the
601 <literal>qdisc
</literal>. Defaults to
602 <literal>no
</literal>.
</para>
606 <term><varname>MultiQueue=
</varname></term>
607 <listitem><para>Takes a boolean argument. Configures whether
608 to use multiple file descriptors (queues) to parallelize
609 packets sending and receiving. Defaults to
610 <literal>no
</literal>.
</para>
614 <term><varname>PacketInfo=
</varname></term>
615 <listitem><para>Takes a boolean argument. Configures whether
616 packets should be prepended with four extra bytes (two flag
617 bytes and two protocol bytes). If disabled it indicates that
618 the packets will be pure IP packets. Defaults to
619 <literal>no
</literal>.
</para>
623 <term><varname>VNetHeader=
</varname></term>
624 <listitem><para>Takes a boolean argument. Configures
625 IFF_VNET_HDR flag for a tap device. It allows sending
626 and receiving larger Generic Segmentation Offload (GSO)
627 packets. This may increase throughput significantly.
629 <literal>no
</literal>.
</para>
633 <term><varname>User=
</varname></term>
634 <listitem><para>User to grant access to the
635 <filename>/dev/net/tun
</filename> device.
</para>
639 <term><varname>Group=
</varname></term>
640 <listitem><para>Group to grant access to the
641 <filename>/dev/net/tun
</filename> device.
</para>
650 <title>[Tap] Section Options
</title>
652 <para>The
<literal>[Tap]
</literal> section only applies for
653 netdevs of kind
<literal>tap
</literal>, and accepts the same keys
654 as the
<literal>[Tun]
</literal> section.
</para>
658 <title>[Bond] Section Options
</title>
660 <para>The
<literal>[Bond]
</literal> section accepts the following
663 <variablelist class='network-directives'
>
665 <term><varname>Mode=
</varname></term>
667 <para>Specifies one of the bonding policies. The default is
668 <literal>balance-rr
</literal> (round robin). Possible values are
669 <literal>balance-rr
</literal>,
670 <literal>active-backup
</literal>,
671 <literal>balance-xor
</literal>,
672 <literal>broadcast
</literal>,
673 <literal>802.3ad
</literal>,
674 <literal>balance-tlb
</literal>, and
675 <literal>balance-alb
</literal>.
681 <term><varname>TransmitHashPolicy=
</varname></term>
683 <para>Selects the transmit hash policy to use for slave
684 selection in balance-xor,
802.3ad, and tlb modes. Possible
686 <literal>layer2
</literal>,
687 <literal>layer3+
4</literal>,
688 <literal>layer2+
3</literal>,
689 <literal>encap2+
3</literal>,
690 <literal>802.3ad
</literal>, and
691 <literal>encap3+
4</literal>.
697 <term><varname>LACPTransmitRate=
</varname></term>
699 <para>Specifies the rate with which link partner transmits
700 Link Aggregation Control Protocol Data Unit packets in
701 802.3ad mode. Possible values are
<literal>slow
</literal>,
702 which requests partner to transmit LACPDUs every
30 seconds,
703 and
<literal>fast
</literal>, which requests partner to
704 transmit LACPDUs every second. The default value is
705 <literal>slow
</literal>.
</para>
710 <term><varname>MIIMonitorSec=
</varname></term>
712 <para>Specifies the frequency that Media Independent
713 Interface link monitoring will occur. A value of zero
714 disables MII link monitoring. This value is rounded down to
715 the nearest millisecond. The default value is
0.
</para>
720 <term><varname>UpDelaySec=
</varname></term>
722 <para>Specifies the delay before a link is enabled after a
723 link up status has been detected. This value is rounded down
724 to a multiple of MIIMonitorSec. The default value is
730 <term><varname>DownDelaySec=
</varname></term>
732 <para>Specifies the delay before a link is disabled after a
733 link down status has been detected. This value is rounded
734 down to a multiple of MIIMonitorSec. The default value is
740 <term><varname>LearnPacketIntervalSec=
</varname></term>
742 <para>Specifies the number of seconds between instances where the bonding
743 driver sends learning packets to each slaves peer switch.
744 The valid range is
1 -
0x7fffffff; the default value is
1. This Option
745 has effect only in balance-tlb and balance-alb modes.
</para>
750 <term><varname>AdSelect=
</varname></term>
752 <para>Specifies the
802.3ad aggregation selection logic to use. Possible values are
753 <literal>stable
</literal>,
754 <literal>bandwidth
</literal>,
755 <literal>count
</literal>
761 <term><varname>FailOverMACPolicy=
</varname></term>
763 <para>Specifies whether active-backup mode should set all slaves to
764 the same MAC address at enslavement or, when enabled, perform special handling of the
765 bond's MAC address in accordance with the selected policy. The default policy is none.
767 <literal>none
</literal>,
768 <literal>active
</literal>,
769 <literal>follow
</literal>
775 <term><varname>ARPValidate=
</varname></term>
777 <para>Specifies whether or not ARP probes and replies should be
778 validated in any mode that supports ARP monitoring, or whether
779 non-ARP traffic should be filtered (disregarded) for link
780 monitoring purposes. Possible values are
781 <literal>none
</literal>,
782 <literal>active
</literal>,
783 <literal>backup
</literal>,
784 <literal>all
</literal>
790 <term><varname>ARPIntervalSec=
</varname></term>
792 <para>Specifies the ARP link monitoring frequency in milliseconds.
793 A value of
0 disables ARP monitoring. The default value is
0.
799 <term><varname>ARPIPTargets=
</varname></term>
801 <para>Specifies the IP addresses to use as ARP monitoring peers when
802 ARPIntervalSec is greater than
0. These are the targets of the ARP request
803 sent to determine the health of the link to the targets.
804 Specify these values in ipv4 dotted decimal format. At least one IP
805 address must be given for ARP monitoring to function. The
806 maximum number of targets that can be specified is
16. The
807 default value is no IP addresses.
813 <term><varname>ARPAllTargets=
</varname></term>
815 <para>Specifies the quantity of ARPIPTargets that must be reachable
816 in order for the ARP monitor to consider a slave as being up.
817 This option affects only active-backup mode for slaves with
818 ARPValidate enabled. Possible values are
819 <literal>any
</literal>,
820 <literal>all
</literal>
826 <term><varname>PrimaryReselectPolicy=
</varname></term>
828 <para>Specifies the reselection policy for the primary slave. This
829 affects how the primary slave is chosen to become the active slave
830 when failure of the active slave or recovery of the primary slave
831 occurs. This option is designed to prevent flip-flopping between
832 the primary slave and other slaves. Possible values are
833 <literal>always
</literal>,
834 <literal>better
</literal>,
835 <literal>failure
</literal>
841 <term><varname>ResendIGMP=
</varname></term>
843 <para>Specifies the number of IGMP membership reports to be issued after
844 a failover event. One membership report is issued immediately after
845 the failover, subsequent packets are sent in each
200ms interval.
846 The valid range is (
0 -
255). Defaults to
1. A value of
0
847 prevents the IGMP membership report from being issued in response
848 to the failover event.
854 <term><varname>PacketsPerSlave=
</varname></term>
856 <para> Specify the number of packets to transmit through a slave before
857 moving to the next one. When set to
0 then a slave is chosen at
858 random. The valid range is (
0 -
65535). Defaults to
1. This option
859 has effect only in balance-rr mode.
865 <term><varname>GratuitousARP=
</varname></term>
867 <para>Specify the number of peer notifications (gratuitous ARPs and
868 unsolicited IPv6 Neighbor Advertisements) to be issued after a
869 failover event. As soon as the link is up on the new slave
870 a peer notification is sent on the bonding device and each
871 VLAN sub-device. This is repeated at each link monitor interval
872 (ARPIntervalSec or MIIMonitorSec, whichever is active) if the number is
873 greater than
1. The valid range is (
0 -
255). Default value is
1.
874 These options affect only the active-backup mode.
880 <term><varname>AllSlavesActive=
</varname></term>
882 <para> A boolean. Specifies that duplicate frames (received on inactive ports)
883 should be dropped false or delivered true. Normally, bonding will drop
884 duplicate frames (received on inactive ports), which is desirable for
885 most users. But there are some times it is nice to allow duplicate
886 frames to be delivered. The default value is false (drop duplicate frames
887 received on inactive ports).
893 <term><varname>MinLinks=
</varname></term>
895 <para>Specifies the minimum number of links that must be active before
896 asserting carrier. The default value is
0.
903 <para>For more detail information see
904 <ulink url=
"https://www.kernel.org/doc/Documentation/networking/bonding.txt">
905 Linux Ethernet Bonding Driver HOWTO
</ulink></para>
910 <title>Example
</title>
912 <title>/etc/systemd/network/bridge.netdev
</title>
914 <programlisting>[NetDev]
916 Kind=bridge
</programlisting>
920 <title>/etc/systemd/network/vlan1.netdev
</title>
922 <programlisting>[Match]
930 Id=
1</programlisting>
933 <title>/etc/systemd/network/ipip.netdev
</title>
934 <programlisting>[NetDev]
940 Local=
192.168.223.238
941 Remote=
192.169.224.239
942 TTL=
64</programlisting>
945 <title>/etc/systemd/network/tap.netdev
</title>
946 <programlisting>[NetDev]
952 PacketInfo=true
</programlisting> </example>
955 <title>/etc/systemd/network/sit.netdev
</title>
956 <programlisting>[NetDev]
963 Remote=
10.65.223.239</programlisting>
967 <title>/etc/systemd/network/gre.netdev
</title>
968 <programlisting>[NetDev]
975 Remote=
10.65.223.239</programlisting>
979 <title>/etc/systemd/network/vti.netdev
</title>
981 <programlisting>[NetDev]
988 Remote=
10.65.223.239</programlisting>
992 <title>/etc/systemd/network/veth.netdev
</title>
993 <programlisting>[NetDev]
998 Name=veth-peer
</programlisting>
1002 <title>/etc/systemd/network/bond.netdev
</title>
1003 <programlisting>[NetDev]
1009 TransmitHashPolicy=layer3+
4
1011 LACPTransmitRate=fast
1016 <title>/etc/systemd/network/dummy.netdev
</title>
1017 <programlisting>[NetDev]
1020 MACAddress=
12:
34:
56:
78:
9a:bc
</programlisting>
1025 <title>See Also
</title>
1027 <citerefentry><refentrytitle>systemd
</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
1028 <citerefentry><refentrytitle>systemd-networkd
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
1029 <citerefentry><refentrytitle>systemd.link
</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
1030 <citerefentry><refentrytitle>systemd.network
</refentrytitle><manvolnum>5</manvolnum></citerefentry>