ip-link (8)

NAME

SYNOPSIS

DESCRIPTION

ip link add - add virtual link
ip link delete - delete virtual link
ip link set - change device attributes
ip link show - display device attributes

EXAMPLES

SEE ALSO

AUTHOR

NAME

ip-link - network device configuration

SYNOPSIS

ip [ OPTIONS ] link { COMMAND | help }

OPTIONS := { -V[ersion] | -s[tatistics] | -r[esolve] | -f[amily] { inet | inet6 | ipx | dnet | link } | -o[neline] }

ip link add [ link DEVICE ] [ name ] NAME
[ txqueuelen PACKETS ]
[ address LLADDR ] [ broadcast LLADDR ]
[ mtu MTU ]
[ numtxqueues QUEUE_COUNT ] [ numrxqueues QUEUE_COUNT ]
type TYPE [ ARGS ]

ip link delete DEVICE type TYPE [ ARGS ]

ip link set { DEVICE | group GROUP } { up | down | arp { on | off } |
promisc { on | off } |
allmulticast { on | off } |
dynamic { on | off } |
multicast { on | off } |
txqueuelen PACKETS |
name NEWNAME |
address LLADDR | broadcast LLADDR |
mtu MTU |
netns PID |
netns NETNSNAME |
alias NAME |
vf NUM [ mac LLADDR ] [ vlan VLANID [ qos VLAN-QOS ] ] [ rate TXRATE ] [ spoofchk { on | off } ] |
master DEVICE
nomaster }

ip link show [ DEVICE | group GROUP ]

DESCRIPTION

ip link add - add virtual link

link DEVICE

specifies the physical device to act operate on.

NAME specifies the name of the new virtual device.

TYPE specifies the type of the new device.

Link types:

bridge - Ethernet Bridge device

can - Controller Area Network interface

dummy - Dummy network interface

ifb - Intermediate Functional Block device

ipoib - IP over Infiniband device

macvlan - Virtual interface base on link layer address (MAC)

vcan - Virtual Local CAN interface

veth - Virtual ethernet interface

vlan - 802.1q tagged virtual LAN interface

vxlan - Virtual eXtended LAN

ip6tnl - Virtual tunnel interface IPv4|IPv6 over IPv6

ipip - Virtual tunnel interface IPv4 over IPv4

sit - Virtual tunnel interface IPv6 over IPv4

gre - Virtual tunnel interface GRE over IPv4

gretap - Virtual L2 tuunel interface GRE over IPv4

ip6gre - Virtual tuunel interface GRE over IPv6

ip6gretap - Virtual L2 tuunel interface GRE over IPv6

numtxqueues QUEUE_COUNT

specifies the number of transmit queues for new device.

numrxqueues QUEUE_COUNT

specifies the number of receive queues for new device.

VXLAN Type Support

For a link of type VXLAN the following additional arguments are supported:

ip link add DEVICE type vxlan id ID dev PHYS_DEV ] [ { group | remote } IPADDR local IPADDR ttl TTL tos TOS port MIN MAX [no]learning [no]proxy [no]rsc [no]l2miss [no]l3miss

id VNI - specifies the VXLAN Network Identifer (or VXLAN Segment Identifier) to use.

dev PHYS_DEV - specifies the physical device to use for tunnel endpoint communication.

group IPADDR - specifies the multicast IP address to join. This parameter cannot be specified with the remote parameter.

remote IPADDR - specifies the unicast destination IP address to use in outgoing packets when the destination link layer address is not known in the VXLAN device forwarding database. This parameter cannot be specified with the group parameter.

local IPADDR - specifies the source IP address to use in outgoing packets.

ttl TTL - specifies the TTL value to use in outgoing packets.

tos TOS - specifies the TOS value to use in outgoing packets.

port MIN MAX - specifies the range of port numbers to use as UDP source ports to communicate to the remote VXLAN tunnel endpoint.

[no]learning - specifies if unknown source link layer addresses and IP addresses are entered into the VXLAN device forwarding database.

[no]rsc - specifies if route short circuit is turned on.

[no]proxy - specifies ARP proxy is turned on.

[no]l2miss - specifies if netlink LLADDR miss notifications are generated.

[no]l3miss - specifies if netlink IP ADDR miss notifications are generated.

IP6GRE/IP6GRETAP Type Support

For a link of type IP6GRE/IP6GRETAP the following additional arguments are supported:

ip link add DEVICE type { ip6gre | ip6gretap } remote ADDR local ADDR [i|o]seq] [i|o]key KEY [i|o]csum hoplimit TTL encaplimit ELIM tclass TCLASS flowlabel FLOWLABEL dscp inherit dev PHYS_DEV

remote ADDR - specifies the remote IPv6 address of the tunnel.

local ADDR - specifies the fixed local IPv6 address for tunneled packets. It must be and address on another interface on this host.

[i|o]seq - serialize packets. The oseq flag enables sequencing of outgoing packets. The iseq flag requires that all input packets are serialized.

[i|o]key KEY - use keyed GRE with key KEY. KEY is either a number or an IPv4 address-like dotted quad. The key parameter specifies the same key to use in both directions. The ikey and okey parameters specify different keys for input and output.

[i|o]csum - generate/require checksums for tunneled packets. The ocsum flag calculates checksums for outgoing packets. The icsum flag requires that all input packets have the correct checksum. The csum flag is equivalent to the combination icsum ocsum.

hoplimit TTL - specifies Hop Limit value to use in outgoing packets.

encaplimit ELIM - specifies a fixed encapsulation limit. Default is 4.

flowlabel FLOWLABEL - specifies a fixed flowlabel.

tclass TCLASS - specifies the traffic class field on tunneled packets, which can be specified as either a two-digit hex value (e.g. c0) or a predefined string (e.g. internet). The value inherit causes the field to be copied from the original IP header. The values inherit/STRING or inherit/00..ff will set the field to STRING or 00..ff when tunneling non-IP packets. The default value is 00.

ip link delete - delete virtual link

DEVICE specifies the virtual device to act operate on. TYPE specifies the type of the device.

dev DEVICE: specifies the physical device to act operate on.

ip link set - change device attributes

dev DEVICE

DEVICE specifies network device to operate on. When configuring SR-IOV Virtual Function (VF) devices, this keyword should specify the associated Physical Function (PF) device.

group GROUP

GROUP has a dual role: If both group and dev are present, then move the device to the specified group. If only a group is specified, then the command operates on all devices in that group.

up and down

change the state of the device to UP or DOWN.

arp on or arp off

change the NOARP flag on the device.

multicast on or multicast off

change the MULTICAST flag on the device.

dynamic on or dynamic off

change the DYNAMIC flag on the device.

name NAME

change the name of the device. This operation is not recommended if the device is running or has some addresses already configured.

txqueuelen NUMBER

txqlen NUMBER

change the transmit queue length of the device.

mtu NUMBER

change the MTU of the device.

address LLADDRESS

change the station address of the interface.

broadcast LLADDRESS

brd LLADDRESS

peer LLADDRESS

change the link layer broadcast address or the peer address when the interface is POINTOPOINT.

netns PID

move the device to the network namespace associated with the process PID.

netns NETNSNAME

move the device to the network namespace associated with name NETNSNAME.

alias NAME

give the device a symbolic name for easy reference.

group GROUP

specify the group the device belongs to. The available groups are listed in file /etc/iproute2/group.

vf NUM

specify a Virtual Function device to be configured. The associated PF device must be specified using the dev parameter.

mac LLADDRESS - change the station address for the specified VF. The vf parameter must be specified.

vlan VLANID - change the assigned VLAN for the specified VF. When specified, all traffic sent from the VF will be tagged with the specified VLAN ID. Incoming traffic will be filtered for the specified VLAN ID, and will have all VLAN tags stripped before being passed to the VF. Setting this parameter to 0 disables VLAN tagging and filtering. The vf parameter must be specified.

qos VLAN-QOS - assign VLAN QOS (priority) bits for the VLAN tag. When specified, all VLAN tags transmitted by the VF will include the specified priority bits in the VLAN tag. If not specified, the value is assumed to be 0. Both the vf and vlan parameters must be specified. Setting both vlan and qos as 0 disables VLAN tagging and filtering for the VF.

rate TXRATE - change the allowed transmit bandwidth, in Mbps, for the specified VF. Setting this parameter to 0 disables rate limiting. The vf parameter must be specified.

spoofchk on|off - turn packet spoof checking on or off for the specified VF.

master DEVICE

set master device of the device (enslave device).

nomaster

unset master device of the device (release device).

Warning: If multiple parameter changes are requested, ip aborts immediately after any of the changes have failed. This is the only case when ip can move the system to an unpredictable state. The solution is to avoid changing several parameters with one ip link set call.

ip link show - display device attributes

dev NAME (default): NAME specifies the network device to show. If this argument is omitted all devices in the default group are listed.
group GROUP: GROUP specifies what group of devices to show.
up: only display running interfaces.

EXAMPLES

ip link show

: Shows the state of all network interfaces on the system.

ip link set dev ppp0 mtu 1400

: Change the MTU the ppp0 device.

ip link add link eth0 name eth0.10 type vlan id 10

: Creates a new vlan device eth0.10 on device eth0.

ip link delete dev eth0.10

: Removes vlan device.

AUTHOR

Original Manpage by Michail Litvak <mci@owl.openwall.com>