man/man8/ip-link.8.in

   1 .TH IP\-LINK 8 "13 Dec 2012" "iproute2" "Linux"
   2 .SH "NAME"
   3 ip-link \- network device configuration
   4 .SH "SYNOPSIS"
   5 .sp
   6 .ad l
   7 .in +8
   8 .ti -8
   9 .B ip
  10 .RI "[ " OPTIONS " ]"
  11 .B link
  12 .RI  " { " COMMAND " | "
  13 .BR help " }"
  14 .sp
  15
  16 .ti -8
  17 .IR OPTIONS " := { "
  18 \fB\-V\fR[\fIersion\fR] |
  19 \fB\-h\fR[\fIuman-readable\fR] |
  20 \fB\-s\fR[\fItatistics\fR] |
  21 \fB\-r\fR[\fIesolve\fR] |
  22 \fB\-f\fR[\fIamily\fR] {
  23 .BR inet " | " inet6 " | " ipx " | " dnet " | " link " } | "
  24 \fB\-o\fR[\fIneline\fR] }
  25
  26 .ti -8
  27 .BI "ip link add"
  28 .RB "[ " link
  29 .IR DEVICE " ]"
  30 .RB "[ " name " ]"
  31 .I NAME
  32 .br
  33 .RB "[ " txqueuelen
  34 .IR PACKETS " ]"
  35 .br
  36 .RB "[ " address
  37 .IR LLADDR " ]"
  38 .RB "[ " broadcast
  39 .IR LLADDR " ]"
  40 .br
  41 .RB "[ " mtu
  42 .IR MTU " ]"
  43 .RB "[ " index
  44 .IR IDX " ]"
  45 .br
  46 .RB "[ " numtxqueues
  47 .IR QUEUE_COUNT " ]"
  48 .RB "[ " numrxqueues
  49 .IR QUEUE_COUNT " ]"
  50 .br
  51 .BR type " TYPE"
  52 .RI "[ " ARGS " ]"
  53
  54 .ti -8
  55 .IR TYPE " := [ "
  56 .BR bridge " | "
  57 .BR bond " | "
  58 .BR can " | "
  59 .BR dummy " | "
  60 .BR hsr " | "
  61 .BR ifb " | "
  62 .BR ipoib " |"
  63 .BR macvlan  " | "
  64 .BR macvtap  " | "
  65 .BR vcan " | "
  66 .BR veth " | "
  67 .BR vlan " | "
  68 .BR vxlan " |"
  69 .BR ip6tnl " |"
  70 .BR ipip " |"
  71 .BR sit " |"
  72 .BR gre " |"
  73 .BR gretap " |"
  74 .BR ip6gre " |"
  75 .BR ip6gretap " |"
  76 .BR vti " |"
  77 .BR nlmon " |"
  78 .BR ipvlan " |"
  79 .BR lowpan " |"
  80 .BR geneve " ]"
  81
  82 .ti -8
  83 .BR "ip link delete " {
  84 .IR DEVICE " | "
  85 .BI "group " GROUP
  86 }
  87 .BI type " TYPE"
  88 .RI "[ " ARGS " ]"
  89
  90 .ti -8
  91 .BR "ip link set " {
  92 .IR DEVICE " | "
  93 .BI "group " GROUP
  94 .RB "} { " up " | " down " | " arp " { " on " | " off " } |"
  95 .br
  96 .BR promisc " { " on " | " off " } |"
  97 .br
  98 .BR allmulticast " { " on " | " off " } |"
  99 .br
 100 .BR dynamic " { " on " | " off " } |"
 101 .br
 102 .BR multicast " { " on " | " off " } |"
 103 .br
 104 .B  txqueuelen
 105 .IR PACKETS " |"
 106 .br
 107 .B  name
 108 .IR NEWNAME " |"
 109 .br
 110 .B  address
 111 .IR LLADDR " |"
 112 .B  broadcast
 113 .IR LLADDR " |"
 114 .br
 115 .B  mtu
 116 .IR MTU " |"
 117 .br
 118 .B  netns
 119 .IR PID " |"
 120 .br
 121 .B  netns
 122 .IR NETNSNAME " |"
 123 .br
 124 .B alias
 125 .IR NAME  " |"
 126 .br
 127 .B vf
 128 .IR NUM " ["
 129 .B  mac
 130 .IR LLADDR " ] ["
 131 .B vlan
 132 .IR VLANID " [ "
 133 .B qos
 134 .IR VLAN-QOS " ] ] ["
 135 .B rate
 136 .IR TXRATE " ] ["
 137 .B max_tx_rate
 138 .IR TXRATE " ] ["
 139 .B min_tx_rate
 140 .IR TXRATE " ] ["
 141 .B spoofchk { on | off } ] [
 142 .B state { auto | enable | disable}
 143 ] |
 144 .br
 145 .B master
 146 .IR DEVICE
 147 .br
 148 .B nomaster
 149 .BR " }"
 150
 151
 152 .ti -8
 153 .B ip link show
 154 .RI "[ " DEVICE " | "
 155 .B group
 156 .IR GROUP " | "
 157 .BR up " | "
 158 .B master
 159 .IR DEVICE " | "
 160 .B type
 161 .IR TYPE " ]"
 162
 163 .ti -8
 164 .B ip link help
 165 .RI "[ " TYPE " ]"
 166
 167 .SH "DESCRIPTION"
 168 .SS ip link add - add virtual link
 169
 170 .TP
 171 .BI link " DEVICE "
 172 specifies the physical device to act operate on.
 173
 174 .I NAME
 175 specifies the name of the new virtual device.
 176
 177 .I TYPE
 178 specifies the type of the new device.
 179 .sp
 180 Link types:
 181
 182 .in +8
 183 .B bridge
 184 - Ethernet Bridge device
 185 .sp
 186 .B bond
 187 - Bonding device
 188 .sp
 189 .B dummy
 190 - Dummy network interface
 191 .sp
 192 .B hsr
 193 - High-availability Seamless Redundancy device
 194 .sp
 195 .B ifb
 196 - Intermediate Functional Block device
 197 .sp
 198 .B ipoib
 199 - IP over Infiniband device
 200 .sp
 201 .B macvlan
 202 - Virtual interface base on link layer address (MAC)
 203 .sp
 204 .B macvtap
 205 - Virtual interface based on link layer address (MAC) and TAP.
 206 .sp
 207 .B vcan
 208 - Virtual Controller Area Network interface
 209 .sp
 210 .B veth
 211 - Virtual ethernet interface
 212 .sp
 213 .BR vlan
 214 - 802.1q tagged virtual LAN interface
 215 .sp
 216 .BR vxlan
 217 - Virtual eXtended LAN
 218 .sp
 219 .BR ip6tnl
 220 - Virtual tunnel interface IPv4|IPv6 over IPv6
 221 .sp
 222 .BR ipip
 223 - Virtual tunnel interface IPv4 over IPv4
 224 .sp
 225 .BR sit
 226 - Virtual tunnel interface IPv6 over IPv4
 227 .sp
 228 .BR gre
 229 - Virtual tunnel interface GRE over IPv4
 230 .sp
 231 .BR gretap
 232 - Virtual L2 tunnel interface GRE over IPv4
 233 .sp
 234 .BR ip6gre
 235 - Virtual tunnel interface GRE over IPv6
 236 .sp
 237 .BR ip6gretap
 238 - Virtual L2 tunnel interface GRE over IPv6
 239 .sp
 240 .BR vti
 241 - Virtual tunnel interface
 242 .sp
 243 .BR nlmon
 244 - Netlink monitoring device
 245 .sp
 246 .BR ipvlan
 247 - Interface for L3 (IPv6/IPv4) based VLANs
 248 .sp
 249 .BR lowpan
 250 - Interface for 6LoWPAN (IPv6) over IEEE 802.15.4 / Bluetooth
 251 .sp
 252 .BR geneve
 253 - GEneric NEtwork Virtualization Encapsulation
 254 .in -8
 255
 256 .TP
 257 .BI numtxqueues " QUEUE_COUNT "
 258 specifies the number of transmit queues for new device.
 259
 260 .TP
 261 .BI numrxqueues " QUEUE_COUNT "
 262 specifies the number of receive queues for new device.
 263
 264 .TP
 265 .BI index " IDX "
 266 specifies the desired index of the new virtual device. The link creation fails, if the index is busy.
 267
 268 .TP
 269 VXLAN Type Support
 270 For a link of type
 271 .I VXLAN
 272 the following additional arguments are supported:
 273
 274 .BI "ip link add " DEVICE
 275 .BI type " vxlan " id " ID"
 276 .R " [ "
 277 .BI dev " PHYS_DEV "
 278 .RB " ] [ { " group " | " remote " } "
 279 .I IPADDR
 280 .R " ] [ "
 281 .BI local " IPADDR "
 282 .R " ] [ "
 283 .BI ttl " TTL "
 284 .R " ] [ "
 285 .BI tos " TOS "
 286 .R " ] [ "
 287 .BI port " MIN MAX "
 288 .R " ] [ "
 289 .I "[no]learning "
 290 .R " ] [ "
 291 .I "[no]proxy "
 292 .R " ] [ "
 293 .I "[no]rsc "
 294 .R " ] [ "
 295 .I "[no]l2miss "
 296 .R " ] [ "
 297 .I "[no]l3miss "
 298 .R " ] [ "
 299 .BI ageing " SECONDS "
 300 .R " ] [ "
 301 .BI maxaddress " NUMBER "
 302 .R " ] [ "
 303 .B gbp
 304 .R " ]"
 305
 306 .in +8
 307 .sp
 308 .BI  id " VNI "
 309 - specifies the VXLAN Network Identifer (or VXLAN Segment
 310 Identifier) to use.
 311
 312 .BI dev " PHYS_DEV"
 313 - specifies the physical device to use for tunnel endpoint communication.
 314
 315 .sp
 316 .BI group " IPADDR"
 317 - specifies the multicast IP address to join.
 318 This parameter cannot be specified with the
 319 .B remote
 320 parameter.
 321
 322 .sp
 323 .BI remote " IPADDR"
 324 - specifies the unicast destination IP address to use in outgoing packets
 325 when the destination link layer address is not known in the VXLAN device
 326 forwarding database. This parameter cannot be specified with the
 327 .B group
 328 parameter.
 329
 330 .sp
 331 .BI local " IPADDR"
 332 - specifies the source IP address to use in outgoing packets.
 333
 334 .sp
 335 .BI ttl " TTL"
 336 - specifies the TTL value to use in outgoing packets.
 337
 338 .sp
 339 .BI tos " TOS"
 340 - specifies the TOS value to use in outgoing packets.
 341
 342 .sp
 343 .BI port " MIN MAX"
 344 - specifies the range of port numbers to use as UDP
 345 source ports to communicate to the remote VXLAN tunnel endpoint.
 346
 347 .sp
 348 .I [no]learning
 349 - specifies if unknown source link layer addresses and IP addresses
 350 are entered into the VXLAN device forwarding database.
 351
 352 .sp
 353 .I [no]rsc
 354 - specifies if route short circuit is turned on.
 355
 356 .sp
 357 .I [no]proxy
 358 - specifies ARP proxy is turned on.
 359
 360 .sp
 361 .I [no]l2miss
 362 - specifies if netlink LLADDR miss notifications are generated.
 363
 364 .sp
 365 .I [no]l3miss
 366 - specifies if netlink IP ADDR miss notifications are generated.
 367
 368 .sp
 369 .BI ageing " SECONDS"
 370 - specifies the lifetime in seconds of FDB entries learnt by the kernel.
 371
 372 .sp
 373 .BI maxaddress " NUMBER"
 374 - specifies the maximum number of FDB entries.
 375
 376 .sp
 377 .B gbp
 378 - enables the Group Policy extension (VXLAN-GBP).
 379
 380 .in +4
 381 Allows to transport group policy context across VXLAN network peers.
 382 If enabled, includes the mark of a packet in the VXLAN header for outgoing
 383 packets and fills the packet mark based on the information found in the
 384 VXLAN header for incomming packets.
 385
 386 Format of upper 16 bits of packet mark (flags);
 387
 388 .in +2
 389 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 390 .br
 391 |-|-|-|-|-|-|-|-|-|D|-|-|A|-|-|-|
 392 .br
 393 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 394
 395 .B D :=
 396 Don't Learn bit. When set, this bit indicates that the egress
 397 VTEP MUST NOT learn the source address of the encapsulated frame.
 398
 399 .B A :=
 400 Indicates that the group policy has already been applied to
 401 this packet. Policies MUST NOT be applied by devices when the A bit is set.
 402 .in -2
 403
 404 Format of lower 16 bits of packet mark (policy ID):
 405
 406 .in +2
 407 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 408 .br
 409 |        Group Policy ID        |
 410 .br
 411 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 412 .in -2
 413
 414 Example:
 415   iptables -A OUTPUT [...] -j MARK --set-mark 0x800FF
 416
 417 .in -4
 418
 419 .in -8
 420
 421 .TP
 422 GRE, IPIP, SIT Type Support
 423 For a link of types
 424 .I GRE/IPIP/SIT
 425 the following additional arguments are supported:
 426
 427 .BI "ip link add " DEVICE
 428 .BR type " { gre | ipip | sit } "
 429 .BI " remote " ADDR " local " ADDR
 430 .R " [ "
 431 .BR encap " { fou | gue | none } "
 432 .R " ] [ "
 433 .BI "encap-sport { " PORT " | auto } "
 434 .R " ] [ "
 435 .BI "encap-dport " PORT
 436 .R " ] [ "
 437 .I " [no]encap-csum "
 438 .R " ] [ "
 439 .I " [no]encap-remcsum "
 440 .R " ]"
 441
 442 .in +8
 443 .sp
 444 .BI  remote " ADDR "
 445 - specifies the remote address of the tunnel.
 446
 447 .sp
 448 .BI  local " ADDR "
 449 - specifies the fixed local address for tunneled packets.
 450 It must be an address on another interface on this host.
 451
 452 .sp
 453 .BR encap " { fou | gue | none } "
 454 - specifies type of secondary UDP encapsulation. "fou" indicates
 455 Foo-Over-UDP, "gue" indicates Generic UDP Encapsulation.
 456
 457 .sp
 458 .BI "encap-sport { " PORT " | auto } "
 459 - specifies the source port in UDP encapsulation.
 460 .IR PORT
 461 indicates the port by number, "auto"
 462 indicates that the port number should be chosen automatically
 463 (the kernel picks a flow based on the flow hash of the
 464 encapsulated packet).
 465
 466 .sp
 467 .I [no]encap-csum
 468 - specifies if UDP checksums are enabled in the secondary
 469 encapsulation.
 470
 471 .sp
 472 .I [no]encap-remcsum
 473 - specifies if Remote Checksum Offload is enabled. This is only
 474 applicable for Generic UDP Encapsulation.
 475
 476 .in -8
 477
 478 .TP
 479 IP6GRE/IP6GRETAP Type Support
 480 For a link of type
 481 .I IP6GRE/IP6GRETAP
 482 the following additional arguments are supported:
 483
 484 .BI "ip link add " DEVICE
 485 .BI type " { ip6gre | ip6gretap }  " remote " ADDR " local " ADDR
 486 .R " [ "
 487 .I "[i|o]seq]"
 488 .R " ] [ "
 489 .I "[i|o]key" KEY
 490 .R " ] [ "
 491 .I " [i|o]csum "
 492 .R " ] [ "
 493 .BI hoplimit " TTL "
 494 .R " ] [ "
 495 .BI encaplimit " ELIM "
 496 .R " ] [ "
 497 .BI tclass " TCLASS "
 498 .R " ] [ "
 499 .BI flowlabel " FLOWLABEL "
 500 .R " ] [ "
 501 .BI "dscp inherit"
 502 .R " ] [ "
 503 .BI dev " PHYS_DEV "
 504 .R " ]"
 505
 506 .in +8
 507 .sp
 508 .BI  remote " ADDR "
 509 - specifies the remote IPv6 address of the tunnel.
 510
 511 .sp
 512 .BI  local " ADDR "
 513 - specifies the fixed local IPv6 address for tunneled packets.
 514 It must be an address on another interface on this host.
 515
 516 .sp
 517 .BI  [i|o]seq
 518 - serialize packets.
 519 The
 520 .B oseq
 521 flag enables sequencing of outgoing packets.
 522 The
 523 .B iseq
 524 flag requires that all input packets are serialized.
 525
 526 .sp
 527 .BI  [i|o]key " KEY"
 528 - use keyed GRE with key
 529 .IR KEY ". "KEY
 530 is either a number or an IPv4 address-like dotted quad.
 531 The
 532 .B key
 533 parameter specifies the same key to use in both directions.
 534 The
 535 .BR ikey " and " okey
 536 parameters specify different keys for input and output.
 537
 538 .sp
 539 .BI  [i|o]csum
 540 - generate/require checksums for tunneled packets.
 541 The
 542 .B ocsum
 543 flag calculates checksums for outgoing packets.
 544 The
 545 .B icsum
 546 flag requires that all input packets have the correct
 547 checksum. The
 548 .B csum
 549 flag is equivalent to the combination
 550 .BR "icsum ocsum" .
 551
 552 .sp
 553 .BI  hoplimit " TTL"
 554 - specifies Hop Limit value to use in outgoing packets.
 555
 556 .sp
 557 .BI  encaplimit " ELIM"
 558 - specifies a fixed encapsulation limit. Default is 4.
 559
 560 .sp
 561 .BI  flowlabel " FLOWLABEL"
 562 - specifies a fixed flowlabel.
 563
 564 .sp
 565 .BI  tclass " TCLASS"
 566 - specifies the traffic class field on
 567 tunneled packets, which can be specified as either a two-digit
 568 hex value (e.g. c0) or a predefined string (e.g. internet).
 569 The value
 570 .B inherit
 571 causes the field to be copied from the original IP header. The
 572 values
 573 .BI "inherit/" STRING
 574 or
 575 .BI "inherit/" 00 ".." ff
 576 will set the field to
 577 .I STRING
 578 or
 579 .IR 00 ".." ff
 580 when tunneling non-IP packets. The default value is 00.
 581
 582 .in -8
 583
 584 .TP
 585 IPoIB Type Support
 586 For a link of type
 587 .I IPoIB
 588 the following additional arguments are supported:
 589
 590 .BI "ip link add " DEVICE " name " NAME
 591 .BI type " ipoib [ " pkey " PKEY ] [" mode " MODE " ]
 592
 593 .in +8
 594 .sp
 595 .BI  pkey " PKEY "
 596 - specifies the IB P-Key to use.
 597
 598 .BI  mode " MODE "
 599 - specifies the mode (datagram or connected) to use.
 600
 601 .TP
 602 GENEVE Type Support
 603 For a link of type
 604 .I GENEVE
 605 the following additional arguments are supported:
 606
 607 .BI "ip link add " DEVICE
 608 .BI type " geneve " id " ID " remote " IPADDR"
 609 .R " [ "
 610 .BI ttl " TTL "
 611 .R " ] [ "
 612 .BI tos " TOS "
 613 .R " ]"
 614
 615 .in +8
 616 .sp
 617 .BI  id " VNI "
 618 - specifies the Virtual Network Identifer to use.
 619
 620 .sp
 621 .BI remote " IPADDR"
 622 - specifies the unicast destination IP address to use in outgoing packets.
 623
 624 .sp
 625 .BI ttl " TTL"
 626 - specifies the TTL value to use in outgoing packets.
 627
 628 .sp
 629 .BI tos " TOS"
 630 - specifies the TOS value to use in outgoing packets.
 631
 632 .in -8
 633
 634 .SS ip link delete - delete virtual link
 635
 636 .TP
 637 .BI dev " DEVICE "
 638 specifies the virtual device to act operate on.
 639
 640 .TP
 641 .BI group " GROUP "
 642 specifies the group of virtual links to delete. Group 0 is not allowed to be
 643 deleted since it is the default group.
 644
 645 .TP
 646 .BI type " TYPE "
 647 specifies the type of the device.
 648
 649 .SS ip link set - change device attributes
 650
 651 .TP
 652 .BI dev " DEVICE "
 653 .I DEVICE
 654 specifies network device to operate on. When configuring SR-IOV Virtual Function
 655 (VF) devices, this keyword should specify the associated Physical Function (PF)
 656 device.
 657
 658 .TP
 659 .BI group " GROUP "
 660 .I GROUP
 661 has a dual role: If both group and dev are present, then move the device to the
 662 specified group. If only a group is specified, then the command operates on
 663 all devices in that group.
 664
 665 .TP
 666 .BR up " and " down
 667 change the state of the device to
 668 .B UP
 669 or
 670 .BR "DOWN" .
 671
 672 .TP
 673 .BR "arp on " or " arp off"
 674 change the
 675 .B NOARP
 676 flag on the device.
 677
 678 .TP
 679 .BR "multicast on " or " multicast off"
 680 change the
 681 .B MULTICAST
 682 flag on the device.
 683
 684 .TP
 685 .BR "dynamic on " or " dynamic off"
 686 change the
 687 .B DYNAMIC
 688 flag on the device. Indicates that address can change when interface goes down (currently
 689 .B NOT
 690 used by the Linux).
 691
 692 .TP
 693 .BI name " NAME"
 694 change the name of the device. This operation is not
 695 recommended if the device is running or has some addresses
 696 already configured.
 697
 698 .TP
 699 .BI txqueuelen " NUMBER"
 700 .TP
 701 .BI txqlen " NUMBER"
 702 change the transmit queue length of the device.
 703
 704 .TP
 705 .BI mtu " NUMBER"
 706 change the
 707 .I MTU
 708 of the device.
 709
 710 .TP
 711 .BI address " LLADDRESS"
 712 change the station address of the interface.
 713
 714 .TP
 715 .BI broadcast " LLADDRESS"
 716 .TP
 717 .BI brd " LLADDRESS"
 718 .TP
 719 .BI peer " LLADDRESS"
 720 change the link layer broadcast address or the peer address when
 721 the interface is
 722 .IR "POINTOPOINT" .
 723
 724 .TP
 725 .BI netns " NETNSNAME " \fR| " PID"
 726 move the device to the network namespace associated with name
 727 .IR "NETNSNAME " or
 728 .RI process " PID".
 729
 730 Some devices are not allowed to change network namespace: loopback, bridge,
 731 ppp, wireless. These are network namespace local devices. In such case
 732 .B ip
 733 tool will return "Invalid argument" error. It is possible to find out if device is local
 734 to a single network namespace by checking
 735 .B netns-local
 736 flag in the output of the
 737 .BR ethtool ":"
 738
 739 .in +8
 740 .B ethtool -k
 741 .I DEVICE
 742 .in -8
 743
 744 To change network namespace for wireless devices the
 745 .B iw
 746 tool can be used. But it allows to change network namespace only for physical devices and by process
 747 .IR PID .
 748
 749 .TP
 750 .BI alias " NAME"
 751 give the device a symbolic name for easy reference.
 752
 753 .TP
 754 .BI vf " NUM"
 755 specify a Virtual Function device to be configured. The associated PF device
 756 must be specified using the
 757 .B dev
 758 parameter.
 759
 760 .in +8
 761 .BI mac " LLADDRESS"
 762 - change the station address for the specified VF. The
 763 .B vf
 764 parameter must be specified.
 765
 766 .sp
 767 .BI vlan " VLANID"
 768 - change the assigned VLAN for the specified VF. When specified, all traffic
 769 sent from the VF will be tagged with the specified VLAN ID. Incoming traffic
 770 will be filtered for the specified VLAN ID, and will have all VLAN tags
 771 stripped before being passed to the VF. Setting this parameter to 0 disables
 772 VLAN tagging and filtering. The
 773 .B vf
 774 parameter must be specified.
 775
 776 .sp
 777 .BI qos " VLAN-QOS"
 778 - assign VLAN QOS (priority) bits for the VLAN tag. When specified, all VLAN
 779 tags transmitted by the VF will include the specified priority bits in the
 780 VLAN tag. If not specified, the value is assumed to be 0. Both the
 781 .B vf
 782 and
 783 .B vlan
 784 parameters must be specified. Setting both
 785 .B vlan
 786 and
 787 .B qos
 788 as 0 disables VLAN tagging and filtering for the VF.
 789
 790 .sp
 791 .BI rate " TXRATE"
 792 -- change the allowed transmit bandwidth, in Mbps, for the specified VF.
 793 Setting this parameter to 0 disables rate limiting.
 794 .B vf
 795 parameter must be specified.
 796 Please use new API
 797 .B "max_tx_rate"
 798 option instead.
 799
 800 .sp
 801 .BI max_tx_rate " TXRATE"
 802 - change the allowed maximum transmit bandwidth, in Mbps, for the specified VF.
 803 .B vf
 804 parameter must be specified.
 805
 806 .sp
 807 .BI min_tx_rate " TXRATE"
 808 - change the allowed minimum transmit bandwidth, in Mbps, for the specified VF.
 809 Minimum TXRATE should be always <= Maximum TXRATE.
 810 .B vf
 811 parameter must be specified.
 812
 813 .sp
 814 .BI spoofchk " on|off"
 815 - turn packet spoof checking on or off for the specified VF.
 816 .sp
 817 .BI state " auto|enable|disable"
 818 - set the virtual link state as seen by the specified VF. Setting to auto means a
 819 reflection of the PF link state, enable lets the VF to communicate with other VFs on
 820 this host even if the PF link state is down, disable causes the HW to drop any packets
 821 sent by the VF.
 822 .in -8
 823
 824 .TP
 825 .BI master " DEVICE"
 826 set master device of the device (enslave device).
 827
 828 .TP
 829 .BI nomaster
 830 unset master device of the device (release device).
 831
 832 .PP
 833 .B Warning:
 834 If multiple parameter changes are requested,
 835 .B ip
 836 aborts immediately after any of the changes have failed.
 837 This is the only case when
 838 .B ip
 839 can move the system to an unpredictable state. The solution
 840 is to avoid changing several parameters with one
 841 .B ip link set
 842 call.
 843
 844 .SS  ip link show - display device attributes
 845
 846 .TP
 847 .BI dev " NAME " (default)
 848 .I NAME
 849 specifies the network device to show.
 850 If this argument is omitted all devices in the default group are listed.
 851
 852 .TP
 853 .BI group " GROUP "
 854 .I GROUP
 855 specifies what group of devices to show.
 856
 857 .TP
 858 .B up
 859 only display running interfaces.
 860
 861 .TP
 862 .BI master " DEVICE "
 863 .I DEVICE
 864 specifies the master device which enslaves devices to show.
 865
 866 .TP
 867 .BI type " TYPE "
 868 .I TYPE
 869 specifies the type of devices to show.
 870
 871 .TP
 872 The show command has additional formatting options:
 873
 874 .RS
 875 .TP
 876 .BR "\-s" , " \-stats", " \-statistics"
 877 output more statistics about packet usage.
 878
 879 .TP
 880 .BR "\-d", " \-details"
 881 output more detailed information.
 882
 883 .TP
 884 .BR "\-h", " \-human", " \-human-readble"
 885 output statistics with human readable values number followed by suffix
 886
 887 .TP
 888 .BR "\-iec"
 889 print human readable rates in IEC units (ie. 1K = 1024).
 890 .RE
 891
 892 .SS  ip link help - display help
 893
 894 .PP
 895 .I "TYPE"
 896 specifies which help of link type to dislpay.
 897
 898 .SS
 899 .I GROUP
 900 may be a number or a string from the file
 901 .B @SYSCONFDIR@/group
 902 which can be manually filled.
 903
 904 .SH "EXAMPLES"
 905 .PP
 906 ip link show
 907 .RS 4
 908 Shows the state of all network interfaces on the system.
 909 .RE
 910 .PP
 911 ip link show type bridge
 912 .RS 4
 913 Shows the bridge devices.
 914 .RE
 915 .PP
 916 ip link show type vlan
 917 .RS 4
 918 Shows the vlan devices.
 919 .RE
 920 .PP
 921 ip link show master br0
 922 .RS 4
 923 Shows devices enslaved by br0
 924 .RE
 925 .PP
 926 ip link set dev ppp0 mtu 1400
 927 .RS 4
 928 Change the MTU the ppp0 device.
 929 .RE
 930 .PP
 931 ip link add link eth0 name eth0.10 type vlan id 10
 932 .RS 4
 933 Creates a new vlan device eth0.10 on device eth0.
 934 .RE
 935 .PP
 936 ip link delete dev eth0.10
 937 .RS 4
 938 Removes vlan device.
 939 .RE
 940
 941 ip link help gre
 942 .RS 4
 943 Display help for the gre link type.
 944 .RE
 945 .PP
 946 ip link add name tun1 type ipip remote 192.168.1.1
 947 local 192.168.1.2 ttl 225 encap gue encap-sport auto
 948 encap-dport 5555 encap-csum encap-remcsum
 949 .RS 4
 950 Creates an IPIP that is encapsulated with Generic UDP Encapsulation,
 951 and the outer UDP checksum and remote checksum offload are enabled.
 952
 953 .RE
 954 .PP
 955 ip link add link wpan0 lowpan0 type lowpan
 956 .RS 4
 957 Creates a 6LoWPAN interface named lowpan0 on the underlying
 958 IEEE 802.15.4 device wpan0.
 959 .RE
 960
 961 .SH SEE ALSO
 962 .br
 963 .BR ip (8),
 964 .BR ip-netns (8)
 965
 966 .SH AUTHOR
 967 Original Manpage by Michail Litvak <mci@owl.openwall.com>