ip link set

Change device attributes. Link is a network device and the corresponding commands display and change the state of devices. link can be abbreviated to l

      ip link set DEVICE { 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 | 
                     alias NAME | vf NUM [ mac LLADDR ] [ vlan VLANID [ qos VLAN-QOS ] ] [ rate TXRATE ] }

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

   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
         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.

   alias NAME
         give the device a symbolic name for easy reference.

   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.

         Warning: If multiple parameter changes are requested, ip exits 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 are listed.

   up    only display running interfaces.


Change the state of the network interface device(s) to UP:
$ ip link set up

Change the state of the network interface device(s) to DOWN:
$ ip link set down

Change the Maximum Transmission units (MTU) size for better performance with a Gigabit NIC/Switch:
$ ip link set mtu 9000 dev eth0
$ ip link set eth0 up

“It is remarkable how easily and insensibly we fall into a particular route, and make a beaten track for ourselves” ~ Henry David Thoreau

Related linux commands

ip - Routing, devices and tunnels.
Equivalent Windows command: ROUTE - Manipulate network routing tables.

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