.TH IP\-LINK 8 "20 Dec 2011" "iproute2" "Linux"
.SH "NAME"
ip-link \- network device configuration
.SH "SYNOPSIS"
.sp
.ad l
.in +8
.ti -8
.B ip
.RI "[ " OPTIONS " ]"
.B link
.RI  " { " COMMAND " | "
.BR help " }"
.sp

.ti -8
.IR OPTIONS " := { "
\fB\-V\fR[\fIersion\fR] |
\fB\-s\fR[\fItatistics\fR] |
\fB\-r\fR[\fIesolve\fR] |
\fB\-f\fR[\fIamily\fR] {
.BR inet " | " inet6 " | " ipx " | " dnet " | " link " } | "
\fB\-o\fR[\fIneline\fR] }

.ti -8
.BI "ip link add link " DEVICE
.RB "[ " name " ]"
.I NAME
.br
.RB "[ " txqueuelen 
.IR PACKETS " ]"
.br
.RB "[ " address
.IR LLADDR " ]"
.RB "[ " broadcast
.IR LLADDR " ]"
.br
.RB "[ " mtu
.IR MTU " ]"
.br
.BR type " TYPE"
.RI "[ " ARGS " ]"

.ti -8
.IR TYPE " := [ "
.BR vlan " | " veth " | " vcan " | " dummy " | " ifb " | " macvlan " | " can " | " bridge " ]"

.ti -8
.BI "ip link delete " DEVICE
.BI type " TYPE"
.RI "[ " ARGS " ]"

.ti -8
.BR "ip link set " {
.IR DEVICE " | "
.BI "group " GROUP
.RB "} { " up " | " down " | " arp " { " on " | " off " } |"
.br
.BR promisc " { " on " | " off " } |"
.br
.BR allmulticast " { " on " | " off " } |"
.br
.BR dynamic " { " on " | " off " } |"
.br
.BR multicast " { " on " | " off " } |"
.br
.B  txqueuelen
.IR PACKETS " |"
.br
.B  name
.IR NEWNAME " |"
.br
.B  address
.IR LLADDR " |"
.B  broadcast
.IR LLADDR " |"
.br
.B  mtu
.IR MTU " |"
.br
.B  netns
.IR PID " |"
.br
.B  netns
.IR NETNSNAME " |"
.br
.B alias
.IR NAME  " |"
.br
.B vf
.IR NUM " ["
.B  mac
.IR LLADDR " ] ["
.B vlan
.IR VLANID " [ "
.B qos
.IR VLAN-QOS " ] ] ["
.B rate
.IR TXRATE " ] ["
.B spoofchk { on | off }
] |
.br
.B mode
.IR LINKMODE " |"
.br
.B state
.IR LINKSTATE " |"
.br
.B master
.IR DEVICE
.br
.B nomaster
.BR " }"


.ti -8
.B ip link show
.RI "[ " DEVICE " | "
.B group
.IR GROUP " ]"

.SH "DESCRIPTION"
.SS ip link add - add virtual link

.TP
.BI link " DEVICE "
specifies the physical device to act operate on.

.I NAME
specifies the name of the new virtual device.

.I TYPE
specifies the type of the new device.
.sp
Link types:

.in +8
.B vlan
- 802.1q tagged virtual LAN interface
.sp
.B veth
- Virtual ethernet interface
.sp
.B vcan
- Virtual Local CAN interface
.sp
.B dummy
- Dummy network interface
.sp
.B ifb
- Intermediate Functional Block device
.sp
.B macvlan
- virtual interface base on link layer address (MAC)
.sp
.B can
- Controller Area Network interface
.sp
.B bridge
- Ethernet Bridge device
.in -8

.SS ip link delete - delete virtual link
.I DEVICE
specifies the virtual  device to act operate on.
.I TYPE
specifies the type of the device.


.TP
.BI dev " DEVICE "
specifies the physical device to act operate on.

.SS ip link set - change device attributes

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

.TP
.BI group " GROUP "
.I 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.

.TP
.BR up " and " down
change the state of the device to
.B UP
or
.BR "DOWN" .

.TP
.BR "arp on " or " arp off"
change the
.B NOARP
flag on the device.

.TP
.BR "multicast on " or " multicast off"
change the
.B MULTICAST
flag on the device.

.TP
.BR "dynamic on " or " dynamic off"
change the
.B DYNAMIC
flag on the device.

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

.TP
.BI txqueuelen " NUMBER"
.TP
.BI txqlen " NUMBER"
change the transmit queue length of the device.

.TP
.BI mtu " NUMBER"
change the
.I MTU
of the device.

.TP
.BI address " LLADDRESS"
change the station address of the interface.

.TP
.BI broadcast " LLADDRESS"
.TP
.BI brd " LLADDRESS"
.TP
.BI peer " LLADDRESS"
change the link layer broadcast address or the peer address when
the interface is
.IR "POINTOPOINT" .

.TP
.BI netns " PID"
move the device to the network namespace associated with the process
.IR "PID".

.TP
.BI netns " NETNSNAME"
move the device to the network namespace associated with name
.IR "NETNSNAME".

.TP
.BI mode " LINKMODE"
allows setting link mode which determines which RFC2863 operational state
the device will transistion to when it is brought up. Setting
.I dormant
mode changes the behaviour so that device goes into DORMANT state instead
of UP when driver is ready.

.TP
.BI state " LINKSTATE"
allows setting the operational link state. The values (defined in RFC2863)
are: UP, DOWN, TESTING, UNKNOWN, DORMANT, NOTPRESENT, LOWERLAYERDOWN.
.TP
.BI alias " NAME"
give the device a symbolic name for easy reference.

.TP
.BI group " GROUP"
specify the group the device belongs to.
The available groups are listed in file
.BR "/etc/iproute2/group" .

.TP
.BI vf " NUM"
specify a Virtual Function device to be configured. The associated PF device
must be specified using the
.B dev
parameter.

.in +8
.BI mac " LLADDRESS"
- change the station address for the specified VF. The
.B vf
parameter must be specified.

.sp
.BI 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
.B vf
parameter must be specified.

.sp
.BI 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
.B vf
and
.B vlan
parameters must be specified. Setting both
.B vlan
and
.B qos
as 0 disables VLAN tagging and filtering for the VF.

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

.sp
.BI spoofchk " on|off"
- turn packet spoof checking on or off for the specified VF.
.in -8

.TP
.BI master " DEVICE"
set master device of the device (enslave device).

.TP
.BI nomaster
unset master device of the device (release device).

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

.SS  ip link show - display device attributes

.TP
.BI dev " NAME " (default)
.I NAME
specifies the network device to show.
If this argument is omitted all devices in the default group are listed.

.TP
.BI group " GROUP "
.I GROUP
specifies what group of devices to show.

.TP
.B up
only display running interfaces.

.SH "EXAMPLES"
.PP
ip link show
.RS 4
Shows the state of all network interfaces on the system.
.RE
.PP
ip link set dev ppp0 mtu 1400
.RS 4
Change the MTU the ppp0 device.
.RE
.PP
ip link add link eth0 name eth0.10 type vlan id 10
.RS 4
Creates a new vlan device eth0.10 on device eth0.
.RE
.PP
ip link delete dev eth0.10
.RS 4
Removes vlan device.
.RE

.SH SEE ALSO
.br
.BR ip (8)

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