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