Provided by: iproute_20111117-1ubuntu2_i386 bug

NAME

       ip - show / manipulate routing, devices, policy routing and tunnels

SYNOPSIS

       ip [ OPTIONS ] OBJECT { COMMAND | help }

       OBJECT := { link | addr | addrlabel | route | rule | neigh | tunnel |
               maddr | mroute }

       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 ]
               type TYPE [ ARGS ]

       TYPE := [ vlan | veth | vcan | dummy | ifb | macvlan | can | bridge]"

       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 ] |
               master DEVICE
               nomaster  }

       ip link show [ DEVICE | group GROUP ]

       ip addr { add | del } IFADDR dev STRING

       ip addr { show | flush } [ dev STRING ] [ scope SCOPE-ID ] [ to PREFIX
               ] [ FLAG-LIST ] [ label PATTERN ]

       IFADDR := PREFIX | ADDR peer PREFIX [ broadcast ADDR ] [ anycast ADDR ]
               [ label STRING ] [ scope SCOPE-ID ]

       SCOPE-ID := [ host | link | global | NUMBER ]

       FLAG-LIST := [ FLAG-LIST ] FLAG

       FLAG := [ permanent | dynamic | secondary | primary | tentative |
               deprecated | dadfailed | temporary ]

       ip addrlabel { add | del } prefix PREFIX [ dev DEV ] [ label NUMBER ]

       ip addrlabel { list | flush }

       ip netns { list }

       ip netns { add | delete } NETNSNAME

       ip netns exec NETNSNAME command ...

       ip route { list | flush } SELECTOR

       ip route save SELECTOR

       ip route restore

       ip route get ADDRESS [ from ADDRESS iif STRING  ] [ oif STRING ] [ tos
               TOS ]

       ip route { add | del | change | append | replace } ROUTE

       SELECTOR := [ root PREFIX ] [ match PREFIX ] [ exact PREFIX ] [ table
               TABLE_ID ] [ proto RTPROTO ] [ type TYPE ] [ scope SCOPE ]

       ROUTE := NODE_SPEC [ INFO_SPEC ]

       NODE_SPEC := [ TYPE ] PREFIX [ tos TOS ] [ table TABLE_ID ] [ proto
               RTPROTO ] [ scope SCOPE ] [ metric METRIC ]

       INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ] ...

       NH := [ via ADDRESS ] [ dev STRING ] [ weight NUMBER ] NHFLAGS

       OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ] [ rtt TIME ] [ rttvar
               TIME ] [ window NUMBER ] [ cwnd NUMBER ] [ ssthresh REALM ] [
               realms REALM ] [ rto_min TIME ] [ initcwnd NUMBER ] [ initrwnd
               NUMBER ]

       TYPE := [ unicast | local | broadcast | multicast | throw | unreachable
               | prohibit | blackhole | nat ]

       TABLE_ID := [ local| main | default | all | NUMBER ]

       SCOPE := [ host | link | global | NUMBER ]

       NHFLAGS := [ onlink | pervasive ]

       RTPROTO := [ kernel | boot | static | NUMBER ]

       ip rule  [ list | add | del | flush ] SELECTOR ACTION

       SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark
               FWMARK[/MASK] ] [ iif STRING ] [ oif STRING ] [ pref NUMBER ]

       ACTION := [ table TABLE_ID ] [ nat ADDRESS ] [ prohibit | reject |
               unreachable ] [ realms [SRCREALM/]DSTREALM ]

       TABLE_ID := [ local | main | default | NUMBER ]

       ip neigh { add | del | change | replace } { ADDR [ lladdr LLADDR ] [
               nud { permanent | noarp | stale | reachable } ] | proxy ADDR }
               [ dev DEV ]

       ip neigh { show | flush } [ to PREFIX ] [ dev DEV ] [ nud STATE ]

       ip ntable change name NAME [ dev DEV ] PARMS

       PARMS := { thresh1 VAL | thresh2 VAL | thresh3 VAL | gc_int MSEC |
               base_reachable MSEC | retrans MSEC | gc_stale MSEC  |
               delay_probe MSEC | queue LEN  | app_probs VAL | ucast_probes
               VAL | mcast_probes VAL  | anycast_delay MSEC | proxy_delay MSEC
               | proxy_queue LEN  | locktime MSEC }

       ip ntable show [ dev DEV ] [ name NAME ]

       ip tunnel { add | change | del | show | prl } [ NAME ]
               [ mode MODE ] [ remote ADDR ] [ local ADDR ]
               [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ] ]
               [ encaplimit ELIM ] [ ttl TTL ]
               [ tos TOS ] [ flowlabel FLOWLABEL ]
               [ prl-default ADDR ] [ prl-nodefault ADDR ] [ prl-delete ADDR ]
               [ [no]pmtudisc ] [ dev PHYS_DEV ] [ dscp inherit ]

       MODE :=  { ipip | gre | sit | isatap | ip6ip6 | ipip6 | any }

       ADDR := { IP_ADDRESS | any }

       TOS := { NUMBER | inherit }

       ELIM := { none | 0..255 }

       TTL := { 1..255 | inherit }

       KEY := { DOTTED_QUAD | NUMBER }

       TIME := NUMBER[s|ms]

       ip maddr [ add | del ] MULTIADDR dev STRING

       ip maddr show [ dev STRING ]

       ip mroute show [ PREFIX ] [ from PREFIX ] [ iif DEVICE ]

       ip monitor [ all | LISTofOBJECTS ]

       ip xfrm XFRM-OBJECT { COMMAND | help }

       XFRM-OBJECT := state | policy | monitor

       ip xfrm state { add | update } ID [ ALGO-LIST ] [ mode MODE ] [ mark
               MARK [ mask MASK ] ] [ reqid REQID ] [ seq SEQ ] [ replay-
               window SIZE ] [ replay-seq SEQ ] [ replay-oseq SEQ ] [ flag
               FLAG-LIST ] [ sel SELECTOR ] [ LIMIT-LIST ] [ encap ENCAP ] [
               coa ADDR[/PLEN] ] [ ctx CTX ]

       ip xfrm state allocspi ID [ mode MODE ] [ mark MARK [ mask MASK ] ] [
               reqid REQID ] [ seq SEQ ] [ min SPI max SPI ]

       ip xfrm state { delete | get } ID [ mark MARK [ mask MASK ] ]

       ip xfrm state { deleteall | list } [ ID ] [ mode MODE ] [ reqid REQID ]
               [ flag FLAG-LIST ]

       ip xfrm state flush [ proto XFRM-PROTO ]

       ip xfrm state count

       ID := [ src ADDR ] [ dst ADDR ] [ proto XFRM-PROTO ] [ spi SPI ]

       XFRM-PROTO := esp | ah | comp | route2 | hao

       ALGO-LIST := [ ALGO-LIST ] ALGO

       ALGO := { enc | auth | comp } ALGO-NAME ALGO-KEY |
               aead ALGO-NAME ALGO-KEY ALGO-ICV-LEN |
               auth-trunc ALGO-NAME ALGO-KEY ALGO-TRUNC-LEN

       MODE := transport | tunnel | ro | in_trigger | beet

       FLAG-LIST := [ FLAG-LIST ] FLAG

       FLAG := noecn | decap-dscp | nopmtudisc | wildrecv | icmp | af-unspec |
               align4

       SELECTOR := [ src ADDR[/PLEN] ] [ dst ADDR[/PLEN] ] [ dev DEV ]
               [ UPSPEC ]

       UPSPEC := proto { PROTO |
               { tcp | udp | sctp | dccp } [ sport PORT ] [ dport PORT ] |
               { icmp | ipv6-icmp | mobility-header } [ type NUMBER ] [ code
               NUMBER ] |
               gre [ key { DOTTED-QUAD | NUMBER } ] }

       LIMIT-LIST := [ LIMIT-LIST ] limit LIMIT

       LIMIT := { time-soft | time-hard | time-use-soft | time-use-hard }
               SECONDS |
               { byte-soft | byte-hard } SIZE |
               { packet-soft | packet-hard } COUNT

       ENCAP := { espinudp | espinudp-nonike } SPORT DPORT OADDR

       ip xfrm policy { add | update } SELECTOR dir DIR [ ctx CTX ] [ mark
               MARK [ mask MASK ] ] [ index INDEX ] [ ptype PTYPE ] [ action
               ACTION ] [ priority PRIORITY ] [ flag FLAG-LIST ] [ LIMIT-LIST
               ] [ TMPL-LIST ]

       ip xfrm policy { delete | get } { SELECTOR | index INDEX } dir DIR [
               ctx CTX ] [ mark MARK [ mask MASK ] ] [ ptype PTYPE ]

       ip xfrm policy { deleteall | list } [ SELECTOR ] [ dir DIR ] [ index
               INDEX ] [ ptype PTYPE ] [ action ACTION ] [ priority PRIORITY ]

       ip xfrm policy flush [ ptype PTYPE ]

       ip xfrm policy count

       SELECTOR := [ src ADDR[/PLEN] ] [ dst ADDR[/PLEN] ] [ dev DEV ] [
               UPSPEC ]

       UPSPEC := proto { PROTO |
               { tcp | udp | sctp | dccp } [ sport PORT ] [ dport PORT ] |
               { icmp | ipv6-icmp | mobility-header } [ type NUMBER ] [ code
               NUMBER ] |
               gre [ key { DOTTED-QUAD | NUMBER } ] }

       DIR := in | out | fwd

       PTYPE := main | sub

       ACTION := allow | block

       FLAG-LIST := [ FLAG-LIST ] FLAG

       FLAG := localok | icmp

       LIMIT-LIST := [ LIMIT-LIST ] limit LIMIT

       LIMIT := { time-soft | time-hard | time-use-soft | time-use-hard }
               SECONDS |
               { byte-soft | byte-hard } SIZE |
               { packet-soft | packet-hard } COUNT

       TMPL-LIST := [ TMPL-LIST ] tmpl TMPL

       TMPL := ID [ mode MODE ] [ reqid REQID ] [ level LEVEL ]

       ID := [ src ADDR ] [ dst ADDR ] [ proto XFRM-PROTO ] [ spi SPI ]

       XFRM-PROTO := esp | ah | comp | route2 | hao

       MODE := transport | tunnel | ro | in_trigger | beet

       LEVEL := required | use

       ip xfrm monitor [ all | LISTofXFRM-OBJECTS ]

OPTIONS

       -V, -Version
              print the version of the ip utility and exit.

       -s, -stats, -statistics
              output  more  information.  If the option appears twice or more,
              the amount of information increases.  As a rule, the information
              is statistics or some time values.

       -l, -loops
              Specify  maximum  number of loops the 'ip addr flush' logic will
              attempt before giving up.  The default is 10.   Zero  (0)  means
              loop until all addresses are removed.

       -f, -family
              followed  by  protocol  family  identifier:  inet, inet6 or link
              ,enforce the protocol family to  use.   If  the  option  is  not
              present,  the  protocol  family is guessed from other arguments.
              If the rest of the command line does not give enough information
              to  guess  the family, ip falls back to the default one, usually
              inet or any.  link is a special family identifier  meaning  that
              no networking protocol is involved.

       -4     shortcut for -family inet.

       -6     shortcut for -family inet6.

       -0     shortcut for -family link.

       -o, -oneline
              output  each  record on a single line, replacing line feeds with
              the '\' character. This is convenient when  you  want  to  count
              records with wc(1)
               or to grep(1) the output.

       -r, -resolve
              use  the  system's  name  resolver to print DNS names instead of
              host addresses.

IP - COMMAND SYNTAX

   OBJECT
       link   - network device.

       address
              - protocol (IP or IPv6) address on a device.

       addrlabel
              - label configuration for protocol address selection.

       neighbour
              - ARP or NDISC cache entry.

       route  - routing table entry.

       rule   - rule in routing policy database.

       maddress
              - multicast address.

       mroute - multicast routing cache entry.

       tunnel - tunnel over IP.

       The names of all objects may be written in full  or  abbreviated  form,
       f.e.  address is abbreviated as addr or just a.

   COMMAND
       Specifies  the  action  to  perform on the object.  The set of possible
       actions depends on the object type.  As a rule, it is possible to  add,
       delete  and  show (or list ) objects, but some objects do not allow all
       of these operations or have some additional commands.  The help command
       is  available  for  all  objects.   It  prints  out a list of available
       commands and argument syntax conventions.

       If no command is given, some default command is assumed.  Usually it is
       list or, if the objects of this class cannot be listed, help.

ip link - network device configuration

       link  is  a  network  device and the corresponding commands display and
       change the state of devices.

   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:

                      vlan - 802.1q tagged virtual LAN interface

                      veth - Virtual ethernet interface

                      vcan - Virtual Local CAN interface

                      dummy - Dummy network interface

                      ifb - Intermediate Functional Block device

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

                      can - Controller Area Network interface

                      bridge - Ethernet Bridge device

   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 Fuction (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.

       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.

ip address - protocol address management.

       The  address  is  a protocol (IP or IPv6) address attached to a network
       device.  Each device  must  have  at  least  one  address  to  use  the
       corresponding  protocol.   It  is  possible  to  have several different
       addresses  attached  to  one   device.    These   addresses   are   not
       discriminated, so that the term alias is not quite appropriate for them
       and we do not use it in this document.

       The ip addr command displays addresses and their properties,  adds  new
       addresses and deletes old ones.

   ip address add - add new protocol address.
       dev NAME
              the name of the device to add the address to.

       local ADDRESS (default)
              the  address of the interface. The format of the address depends
              on the protocol. It is a dotted quad for IP and  a  sequence  of
              hexadecimal halfwords separated by colons for IPv6.  The ADDRESS
              may be followed by a slash and a decimal  number  which  encodes
              the network prefix length.

       peer ADDRESS
              the  address  of the remote endpoint for pointopoint interfaces.
              Again, the ADDRESS may be followed by  a  slash  and  a  decimal
              number,  encoding  the network prefix length.  If a peer address
              is specified, the local address cannot  have  a  prefix  length.
              The  network prefix is associated with the peer rather than with
              the local address.

       broadcast ADDRESS
              the broadcast address on the interface.

              It is possible to use the special symbols '+' and '-' instead of
              the  broadcast  address.  In this case, the broadcast address is
              derived by setting/resetting the  host  bits  of  the  interface
              prefix.

       label NAME
              Each  address  may  be  tagged with a label string.  In order to
              preserve compatibility with Linux-2.0 net aliases,  this  string
              must  coincide  with  the name of the device or must be prefixed
              with the device name followed by colon.

       scope SCOPE_VALUE
              the scope  of  the  area  where  this  address  is  valid.   The
              available  scopes  are  listed  in file /etc/iproute2/rt_scopes.
              Predefined scope values are:

                      global - the address is globally valid.

                      site - (IPv6 only) the address is site local, i.e. it is
                      valid inside this site.

                      link  - the address is link local, i.e. it is valid only
                      on this device.

                      host - the address is valid only inside this host.

   ip address delete - delete protocol address
       Arguments: coincide with the arguments of ip addr add.  The device name
       is  a  required  argument.  The rest are optional.  If no arguments are
       given, the first address is deleted.

   ip address show - look at protocol addresses
       dev NAME (default)
              name of device.

       scope SCOPE_VAL
              only list addresses with this scope.

       to PREFIX
              only list addresses matching this prefix.

       label PATTERN
              only list addresses with labels matching the  PATTERN.   PATTERN
              is a usual shell style pattern.

       dynamic and permanent
              (IPv6  only)  only  list  addresses  installed  due to stateless
              address configuration  or  only  list  permanent  (not  dynamic)
              addresses.

       tentative
              (IPv6  only)  only  list  addresses  which  have  not yet passed
              duplicate address detection.

       deprecated
              (IPv6 only) only list deprecated addresses.

       dadfailed
              (IPv6 only) only list  addresses  which  have  failed  duplicate
              address detection.

       temporary
              (IPv6 only) only list temporary addresses.

       primary and secondary
              only list primary (or secondary) addresses.

   ip address flush - flush protocol addresses
       This command flushes the protocol addresses selected by some criteria.

       This command has the same arguments as show.  The difference is that it
       does not run when no arguments are given.

       Warning: This command (and other flush  commands  described  below)  is
       pretty  dangerous.   If you make a mistake, it will not forgive it, but
       will cruelly purge all the addresses.

       With the -statistics option, the command becomes verbose. It prints out
       the  number of deleted addresses and the number of rounds made to flush
       the address list.  If this option is given twice, ip  addr  flush  also
       dumps all the deleted addresses in the format described in the previous
       subsection.

ip addrlabel - protocol address label management.

       IPv6 address label is used for address selection described in RFC 3484.
       Precedence is managed by userspace, and only label is stored in kernel.

   ip addrlabel add - add an address label
       the command adds an address label entry to the kernel.

       prefix PREFIX

       dev DEV
              the outgoing interface.

       label NUMBER
              the label for the prefix.  0xffffffff is reserved.

   ip addrlabel del - delete an address label
       the  command  deletes an address label entry in the kernel.  Arguments:
       coincide with the arguments of  ip  addrlabel  add  but  label  is  not
       required.

   ip addrlabel list - list address labels
       the command show contents of address labels.

   ip addrlabel flush - flush address labels
       the  command  flushes  the  contents  of address labels and it does not
       restore default settings.

ip neighbour - neighbour/arp tables management.

       neighbour objects establish bindings  between  protocol  addresses  and
       link  layer  addresses  for  hosts  sharing  the  same link.  Neighbour
       entries are organized into tables. The IPv4 neighbour table is known by
       another name - the ARP table.

       The   corresponding  commands  display  neighbour  bindings  and  their
       properties, add new neighbour entries and delete old ones.

   ip neighbour add - add a new neighbour entry
   ip neighbour change - change an existing entry
   ip neighbour replace - add a new entry or change an existing one
       These commands create new neighbour records or update existing ones.

       to ADDRESS (default)
              the protocol address of the neighbour. It is either an  IPv4  or
              IPv6 address.

       dev NAME
              the interface to which this neighbour is attached.

       lladdr LLADDRESS
              the  link layer address of the neighbour.  LLADDRESS can also be
              null.

       nud NUD_STATE
              the state of the neighbour entry.  nud is  an  abbreviation  for
              'Neighbour Unreachability Detection'.  The state can take one of
              the following values:

                      permanent - the neighbour entry is valid forever and can
                      be only be removed administratively.

                      noarp  -  the  neighbour  entry is valid. No attempts to
                      validate this entry will be made but it can  be  removed
                      when its lifetime expires.

                      reachable  -  the  neighbour  entry  is  valid until the
                      reachability timeout expires.

                      stale - the neighbour entry  is  valid  but  suspicious.
                      This  option  to  ip neigh does not change the neighbour
                      state if it was valid and the address is not changed  by
                      this command.

   ip neighbour delete - delete a neighbour entry
       This command invalidates a neighbour entry.

       The arguments are the same as with ip neigh add, except that lladdr and
       nud are ignored.

       Warning: Attempts to delete or manually change a noarp entry created by
       the  kernel  may  result in unpredictable behaviour.  Particularly, the
       kernel may try to resolve this address even on a NOARP interface or  if
       the address is multicast or broadcast.

   ip neighbour show - list neighbour entries
       This commands displays neighbour tables.

       to ADDRESS (default)
              the prefix selecting the neighbours to list.

       dev NAME
              only list the neighbours attached to this device.

       unused only list neighbours which are not currently in use.

       nud NUD_STATE
              only  list  neighbour  entries  in  this state.  NUD_STATE takes
              values listed below or the special value  all  which  means  all
              states.   This  option may occur more than once.  If this option
              is absent, ip lists all entries except for none and noarp.

   ip neighbour flush - flush neighbour entries
       This command flushes neighbour tables, selecting entries  to  flush  by
       some criteria.

       This  command has the same arguments as show.  The differences are that
       it does not run when no arguments  are  given,  and  that  the  default
       neighbour states to be flushed do not include permanent and noarp.

       With  the  -statistics  option, the command becomes verbose.  It prints
       out the number of deleted neighbours and the number of rounds  made  to
       flush  the  neighbour  table.   If  the option is given twice, ip neigh
       flush also dumps all the deleted neighbours.

ip ntable - neighbour table configuration

       Display and change the parameters for the neighbour tables.

   ip ntable show - list the ip neighbour tables
       This commands displays neighbour table parameters and statistics.

       dev DEV
              only list the table attached to this device.

       name NAME
              only lists the table with the given name.

   ip ntable change - modify table parameter
       This command allows modifying table parameters such as timers and queue
       lengths.

       name NAME
              the name of the table to modify.

       dev DEV
              the name of the device to modify the table values.

ip route - routing table management

       Manipulate  route entries in the kernel routing tables keep information
       about paths to other networked nodes.

       Route types:

               unicast  -  the  route  entry  describes  real  paths  to   the
               destinations covered by the route prefix.

               unreachable  - these destinations are unreachable.  Packets are
               discarded and the ICMP message host unreachable  is  generated.
               The local senders get an EHOSTUNREACH error.

               blackhole  -  these  destinations are unreachable.  Packets are
               discarded silently.  The local senders get an EINVAL error.

               prohibit - these destinations  are  unreachable.   Packets  are
               discarded  and  the ICMP message communication administratively
               prohibited is generated.   The  local  senders  get  an  EACCES
               error.

               local  -  the  destinations  are  assigned  to  this host.  The
               packets are looped back and delivered locally.

               broadcast - the  destinations  are  broadcast  addresses.   The
               packets are sent as link broadcasts.

               throw  -  a  special  control  route  used together with policy
               rules. If such a route is selected, lookup  in  this  table  is
               terminated  pretending that no route was found.  Without policy
               routing it is equivalent to the absence of  the  route  in  the
               routing  table.   The  packets are dropped and the ICMP message
               net  unreachable  is  generated.   The  local  senders  get  an
               ENETUNREACH error.

               nat  - a special NAT route.  Destinations covered by the prefix
               are considered  to  be  dummy  (or  external)  addresses  which
               require   translation   to   real  (or  internal)  ones  before
               forwarding.  The addresses to translate to  are  selected  with
               the  attribute  Warning:  Route  NAT  is no longer supported in
               Linux 2.6.

               via.

               anycast  -  not  implemented  the  destinations   are   anycast
               addresses assigned to this host.  They are mainly equivalent to
               local with one difference: such addresses are invalid when used
               as the source address of any packet.

               multicast  -  a special type used for multicast routing.  It is
               not present in normal routing tables.

       Route tables: Linux-2.x can pack routes  into  several  routing  tables
       identified  by a number in the range from 1 to 2^31 or by name from the
       file /etc/iproute2/rt_tables By default all normal routes are  inserted
       into  the  main table (ID 254) and the kernel only uses this table when
       calculating routes.  Values (0, 253, 254, and  255)  are  reserved  for
       built-in use.

       Actually,  one  other  table always exists, which is invisible but even
       more important.  It is the local table (ID 255).  This  table  consists
       of routes for local and broadcast addresses.  The kernel maintains this
       table automatically and the administrator usually need not modify it or
       even look at it.

       The multiple routing tables enter the game when policy routing is used.

   ip route add - add new route
   ip route change - change route
   ip route replace - change or add new one
       to TYPE PREFIX (default)
              the  destination  prefix  of  the route.  If TYPE is omitted, ip
              assumes type unicast.  Other values of TYPE  are  listed  above.
              PREFIX  is  an IP or IPv6 address optionally followed by a slash
              and the prefix length.  If the length of the prefix is  missing,
              ip  assumes  a  full-length host route.  There is also a special
              PREFIX default - which is equivalent to IP 0/0 or to IPv6 ::/0.

       tos TOS

       dsfield TOS
              the Type Of Service (TOS) key.  This key has no associated  mask
              and  the  longest match is understood as: First, compare the TOS
              of the route and of the packet.  If they are not equal, then the
              packet  may  still match a route with a zero TOS.  TOS is either
              an  8   bit   hexadecimal   number   or   an   identifier   from
              /etc/iproute2/rt_dsfield.

       metric NUMBER

       preference NUMBER
              the preference value of the route.  NUMBER is an arbitrary 32bit
              number.

       table TABLEID
              the table to add this route to.  TABLEID may be a  number  or  a
              string from the file /etc/iproute2/rt_tables.  If this parameter
              is omitted, ip assumes the main table,  with  the  exception  of
              local  ,  broadcast and nat routes, which are put into the local
              table by default.

       dev NAME
              the output device name.

       via ADDRESS
              the address of the nexthop router.  Actually, the sense of  this
              field  depends  on the route type.  For normal unicast routes it
              is either the true next hop router or, if it is a  direct  route
              installed  in  BSD compatibility mode, it can be a local address
              of the interface.  For NAT routes it is the first address of the
              block of translated IP destinations.

       src ADDRESS
              the  source  address  to prefer when sending to the destinations
              covered by the route prefix.

       realm REALMID
              the realm to which this route is assigned.   REALMID  may  be  a
              number or a string from the file /etc/iproute2/rt_realms.

       mtu MTU

       mtu lock MTU
              the MTU along the path to the destination.  If the modifier lock
              is not used, the MTU may be updated by the kernel  due  to  Path
              MTU  Discovery.   If  the  modifier  lock  is  used, no path MTU
              discovery will be tried, all packets will be sent without the DF
              bit in IPv4 case or fragmented to MTU for IPv6.

       window NUMBER
              the  maximal  window for TCP to advertise to these destinations,
              measured in bytes.  It limits maximal data bursts that  our  TCP
              peers are allowed to send to us.

       rtt TIME
              the  initial  RTT  ('Round Trip Time') estimate. If no suffix is
              specified the units  are  raw  values  passed  directly  to  the
              routing  code  to maintain compatibility with previous releases.
              Otherwise if a suffix of s, sec  or  secs  is  used  to  specify
              seconds and ms, msec or msecs to specify milliseconds.

       rttvar TIME (2.3.15+ only)
              the  initial RTT variance estimate. Values are specified as with
              rtt above.

       rto_min TIME (2.6.23+ only)
              the minimum TCP Retransmission TimeOut to use when communicating
              with this destination.  Values are specified as with rtt above.

       ssthresh NUMBER (2.3.15+ only)
              an estimate for the initial slow start threshold.

       cwnd NUMBER (2.3.15+ only)
              the clamp for congestion window.  It is ignored if the lock flag
              is not used.

       initcwnd NUMBER (2.5.70+ only)
              the initial congestion  window  size  for  connections  to  this
              destination.  Actual window size is this value multiplied by the
              MSS (``Maximal Segment Size'') for same connection. The  default
              is zero, meaning to use the values specified in RFC2414.

       initrwnd NUMBER (2.6.33+ only)
              the   initial  receive  window  size  for  connections  to  this
              destination.  Actual window size is this value multiplied by the
              MSS  of  the  connection.  The default value is zero, meaning to
              use Slow Start value.

       advmss NUMBER (2.3.15+ only)
              the  MSS  ('Maximal  Segment  Size')  to  advertise   to   these
              destinations  when  establishing  TCP connections.  If it is not
              given, Linux uses a default value calculated from the first  hop
              device  MTU.   (If  the path to these destination is asymmetric,
              this guess may be wrong.)

       reordering NUMBER (2.3.15+ only)
              Maximal reordering on the path to this destination.   If  it  is
              not  given,  Linux  uses the value selected with sysctl variable
              net/ipv4/tcp_reordering.

       nexthop NEXTHOP
              the nexthop of a multipath route.  NEXTHOP is  a  complex  value
              with its own syntax similar to the top level argument lists:

                      via ADDRESS - is the nexthop router.

                      dev NAME - is the output device.

                      weight  NUMBER  -  is  a  weight  for  this element of a
                      multipath route reflecting  its  relative  bandwidth  or
                      quality.

       scope SCOPE_VAL
              the  scope  of  the  destinations  covered  by the route prefix.
              SCOPE_VAL  may  be  a  number  or  a  string   from   the   file
              /etc/iproute2/rt_scopes.   If  this  parameter  is  omitted,  ip
              assumes scope global for all  gatewayed  unicast  routes,  scope
              link  for direct unicast and broadcast routes and scope host for
              local routes.

       protocol RTPROTO
              the routing protocol identifier of this route.  RTPROTO may be a
              number  or  a  string from the file /etc/iproute2/rt_protos.  If
              the routing protocol ID is not given, ip assumes  protocol  boot
              (i.e.  it  assumes  the  route  was added by someone who doesn't
              understand what they are doing).  Several protocol values have a
              fixed interpretation.  Namely:

                      redirect  -  the  route  was  installed  due  to an ICMP
                      redirect.

                      kernel - the route was installed by  the  kernel  during
                      autoconfiguration.

                      boot  -  the  route  was  installed  during  the  bootup
                      sequence.  If a routing daemon starts, it will purge all
                      of them.

                      static - the route was installed by the administrator to
                      override dynamic routing. Routing  daemon  will  respect
                      them and, probably, even advertise them to its peers.

                      ra  -  the  route  was  installed  by  Router  Discovery
                      protocol.

              The rest of the values are not reserved and the administrator is
              free to assign (or not to assign) protocol tags.

       onlink pretend that the nexthop is directly attached to this link, even
              if it does not match any interface prefix.

   ip route delete - delete route
       ip route del has  the  same  arguments  as  ip  route  add,  but  their
       semantics are a bit different.

       Key  values (to, tos, preference and table) select the route to delete.
       If optional attributes are present, ip verifies that they coincide with
       the  attributes of the route to delete.  If no route with the given key
       and attributes was found, ip route del fails.

   ip route show - list routes
       the command displays the contents of the routing tables or the route(s)
       selected by some criteria.

       to SELECTOR (default)
              only  select  routes  from  the  given  range  of  destinations.
              SELECTOR consists of an optional modifier (root, match or exact)
              and  a  prefix.   root  PREFIX  selects routes with prefixes not
              shorter than PREFIX.  F.e.  root 0/0 selects the entire  routing
              table.   match  PREFIX  selects  routes with prefixes not longer
              than PREFIX.  F.e.  match 10.0/16 selects 10.0/16, 10/8 and 0/0,
              but  it does not select 10.1/16 and 10.0.0/24.  And exact PREFIX
              (or just PREFIX) selects  routes  with  this  exact  prefix.  If
              neither  of  these options are present, ip assumes root 0/0 i.e.
              it lists the entire table.

       tos TOS
              dsfield TOS only select routes with the given TOS.

       table TABLEID
              show the routes from this table(s).  The default setting  is  to
              show tablemain.  TABLEID may either be the ID of a real table or
              one of the special values:

                      all - list all of the tables.

                      cache - dump the routing cache.

       cloned

       cached list cloned routes i.e. routes  which  were  dynamically  forked
              from  other  routes  because some route attribute (f.e. MTU) was
              updated.  Actually, it is equivalent to table cache.

       from SELECTOR
              the same syntax as for to, but it binds the source address range
              rather  than destinations.  Note that the from option only works
              with cloned routes.

       protocol RTPROTO
              only list routes of this protocol.

       scope SCOPE_VAL
              only list routes with this scope.

       type TYPE
              only list routes of this type.

       dev NAME
              only list routes going via this device.

       via PREFIX
              only list routes going  via  the  nexthop  routers  selected  by
              PREFIX.

       src PREFIX
              only  list  routes  with  preferred source addresses selected by
              PREFIX.

       realm REALMID

       realms FROMREALM/TOREALM
              only list routes with these realms.

   ip route flush - flush routing tables
       this command flushes routes selected by some criteria.

       The arguments have the same syntax and semantics as the arguments of ip
       route  show,  but  routing  tables are not listed but purged.  The only
       difference is the default action: show dumps all the  IP  main  routing
       table but flush prints the helper page.

       With the -statistics option, the command becomes verbose. It prints out
       the number of deleted routes and the number of rounds made to flush the
       routing  table. If the option is given twice, ip route flush also dumps
       all the  deleted  routes  in  the  format  described  in  the  previous
       subsection.

   ip route get - get a single route
       this  command  gets  a  single  route  to  a destination and prints its
       contents exactly as the kernel sees it.

       to ADDRESS (default)
              the destination address.

       from ADDRESS
              the source address.

       tos TOS

       dsfield TOS
              the Type Of Service.

       iif NAME
              the device from which this packet is expected to arrive.

       oif NAME
              force the output device on which this packet will be routed.

       connected
              if no source address (option from) was given, relookup the route
              with  the  source set to the preferred address received from the
              first lookup.  If policy routing is used, it may be a  different
              route.

       Note  that  this  operation  is  not equivalent to ip route show.  show
       shows existing routes.  get resolves them and  creates  new  clones  if
       necessary.   Essentially,  get  is equivalent to sending a packet along
       this path.  If the iif argument is not  given,  the  kernel  creates  a
       route  to  output  packets  towards the requested destination.  This is
       equivalent to pinging the destination with a  subsequent  ip  route  ls
       cache,  however,  no packets are actually sent.  With the iif argument,
       the kernel pretends that a  packet  arrived  from  this  interface  and
       searches for a path to forward the packet.

   ip route save - save routing table information to stdout
       this  command  behaves like ip route show except that the output is raw
       data suitable for passing to ip route restore.

   ip route restore - restore routing table information from stdin
       this command expects to read a data stream as returned  from  ip  route
       save.  It will attempt to restore the routing table information exactly
       as it was at the time of the save, so any translation of information in
       the  stream  (such as device indexes) must be done first.  Any existing
       routes are left unchanged.  Any routes specified  in  the  data  stream
       that already exist in the table will be ignored.

ip rule - routing policy database management

       Rules  in  the  routing  policy  database  control  the route selection
       algorithm.

       Classic routing algorithms used in the Internet make routing  decisions
       based  only  on  the destination address of packets (and in theory, but
       not in practice, on the TOS field).

       In some circumstances we want to route  packets  differently  depending
       not  only  on  destination  addresses, but also on other packet fields:
       source address, IP protocol, transport protocol ports  or  even  packet
       payload.  This task is called 'policy routing'.

       To  solve  this task, the conventional destination based routing table,
       ordered according to  the  longest  match  rule,  is  replaced  with  a
       'routing  policy database' (or RPDB), which selects routes by executing
       some set of rules.

       Each  policy  routing  rule  consists  of  a  selector  and  an  action
       predicate.   The  RPDB  is scanned in the order of increasing priority.
       The selector of each rule is applied to  {source  address,  destination
       address,  incoming interface, tos, fwmark} and, if the selector matches
       the packet, the action is performed.  The action predicate  may  return
       with  success.   In  this  case, it will either give a route or failure
       indication and the RPDB  lookup  is  terminated.  Otherwise,  the  RPDB
       program continues on the next rule.

       Semantically,  natural  action  is to select the nexthop and the output
       device.

       At startup time the kernel configures the default  RPDB  consisting  of
       three rules:

       1.     Priority:  0,  Selector:  match anything, Action: lookup routing
              table local (ID 255).  The local  table  is  a  special  routing
              table  containing  high  priority  control  routes for local and
              broadcast addresses.

              Rule 0 is special. It cannot be deleted or overridden.

       2.     Priority:  32766,  Selector:  match  anything,  Action:   lookup
              routing  table  main  (ID  254).   The  main table is the normal
              routing table containing all non-policy routes. This rule may be
              deleted and/or overridden with other ones by the administrator.

       3.     Priority:   32767,  Selector:  match  anything,  Action:  lookup
              routing table default (ID 253).  The default table is empty.  It
              is  reserved  for  some  post-processing  if no previous default
              rules selected the packet.  This rule may also be deleted.

       Each RPDB entry has  additional  attributes.   F.e.  each  rule  has  a
       pointer  to  some  routing  table.   NAT and masquerading rules have an
       attribute to select new IP address  to  translate/masquerade.   Besides
       that,  rules  have  some optional attributes, which routes have, namely
       realms.  These values do not override those contained  in  the  routing
       tables.  They are only used if the route did not select any attributes.

       The RPDB may contain rules of the following types:

               unicast  - the rule prescribes to return the route found in the
               routing table referenced by the rule.

               blackhole - the rule prescribes to silently drop the packet.

               unreachable - the rule prescribes to  generate  a  'Network  is
               unreachable' error.

               prohibit  -  the  rule prescribes to generate 'Communication is
               administratively prohibited' error.

               nat - the rule prescribes to translate the  source  address  of
               the IP packet into some other value.

   ip rule add - insert a new rule
   ip rule delete - delete a rule
       type TYPE (default)
              the type of this rule.  The list of valid types was given in the
              previous subsection.

       from PREFIX
              select the source prefix to match.

       to PREFIX
              select the destination prefix to match.

       iif NAME
              select the incoming  device  to  match.   If  the  interface  is
              loopback,  the  rule  only matches packets originating from this
              host.  This means that you may create  separate  routing  tables
              for forwarded and local packets and, hence, completely segregate
              them.

       oif NAME
              select the outgoing device to match.  The outgoing interface  is
              only  available  for packets originating from local sockets that
              are bound to a device.

       tos TOS

       dsfield TOS
              select the TOS value to match.

       fwmark MARK
              select the fwmark value to match.

       priority PREFERENCE
              the priority of this rule.  Each rule should have an  explicitly
              set unique priority value.  The options preference and order are
              synonyms with priority.

       table TABLEID
              the routing table identifier to  lookup  if  the  rule  selector
              matches.  It is also possible to use lookup instead of table.

       realms FROM/TO
              Realms  to  select  if  the  rule  matched and the routing table
              lookup succeeded.  Realm TO is only used if the  route  did  not
              select any realm.

       nat ADDRESS
              The  base  of  the  IP  address  block  to translate (for source
              addresses).  The ADDRESS may be either the start of the block of
              NAT  addresses  (selected by NAT routes) or a local host address
              (or even zero).  In the last case the router does not  translate
              the packets, but masquerades them to this address.  Using map-to
              instead of nat means the same thing.

              Warning: Changes to the RPDB made with  these  commands  do  not
              become  active  immediately.   It is assumed that after a script
              finishes a batch of updates, it flushes the routing  cache  with
              ip route flush cache.

   ip rule flush - also dumps all the deleted rules.
       This command has no arguments.

   ip rule show - list rules
       This  command  has  no arguments.  The options list or lst are synonyms
       with show.

ip maddress - multicast addresses management

       maddress objects are multicast addresses.

   ip maddress show - list multicast addresses
       dev NAME (default)
              the device name.

   ip maddress add - add a multicast address
   ip maddress delete - delete a multicast address
       these commands attach/detach a static link layer multicast  address  to
       listen  on  the interface.  Note that it is impossible to join protocol
       multicast groups statically.  This  command  only  manages  link  layer
       addresses.

       address LLADDRESS (default)
              the link layer multicast address.

       dev NAME
              the device to join/leave this multicast address.

ip mroute - multicast routing cache management

       mroute  objects  are  multicast routing cache entries created by a user
       level mrouting daemon (f.e.  pimd or mrouted ).

       Due to the limitations  of  the  current  interface  to  the  multicast
       routing   engine,   it   is   impossible   to   change  mroute  objects
       administratively, so we may only display them.  This limitation will be
       removed in the future.

   ip mroute show - list mroute cache entries
       to PREFIX (default)
              the  prefix  selecting  the  destination  multicast addresses to
              list.

       iif NAME
              the interface on which multicast packets are received.

       from PREFIX
              the prefix selecting the IP source addresses  of  the  multicast
              route.

ip tunnel - tunnel configuration

       tunnel  objects  are  tunnels,  encapsulating packets in IP packets and
       then sending them over the IP  infrastructure.   The  encapulating  (or
       outer)  address  family  is specified by the -f option.  The default is
       IPv4.

   ip tunnel add - add a new tunnel
   ip tunnel change - change an existing tunnel
   ip tunnel delete - destroy a tunnel
       name NAME (default)
              select the tunnel device name.

       mode MODE
              set the tunnel mode. Available modes depend on the encapsulating
              address family.
              Modes  for  IPv4  encapsulation available: ipip, sit, isatap and
              gre.
              Modes for IPv6 encapsulation available: ip6ip6, ipip6 and any.

       remote ADDRESS
              set the remote endpoint of the tunnel.

       local ADDRESS
              set the fixed local address for tunneled packets.  It must be an
              address on another interface of this host.

       ttl N  set  a  fixed  TTL  N on tunneled packets.  N is a number in the
              range 1--255. 0 is a special value meaning that packets  inherit
              the  TTL value.  The default value for IPv4 tunnels is: inherit.
              The default value for IPv6 tunnels is: 64.

       tos T

       dsfield T

       tclass T
              set a fixed TOS  (or  traffic  class  in  IPv6)  T  on  tunneled
              packets.  The default value is: inherit.

       dev NAME
              bind the tunnel to the device NAME so that tunneled packets will
              only be routed via this device and will not be able to escape to
              another device when the route to endpoint changes.

       nopmtudisc
              disable  Path  MTU  Discovery  on this tunnel.  It is enabled by
              default.  Note that  a  fixed  ttl  is  incompatible  with  this
              option: tunnelling with a fixed ttl always makes pmtu discovery.

       key K

       ikey K

       okey K (  only  GRE  tunnels  ) use keyed GRE with key K. K is either a
              number or an IP address-like dotted  quad.   The  key  parameter
              sets  the  key  to  use  in  both directions.  The ikey and okey
              parameters set different keys for input and output.

       csum, icsum, ocsum
              ( only GRE tunnels )  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.

       seq, iseq, oseq
              ( only GRE tunnels ) serialize packets.  The oseq  flag  enables
              sequencing of outgoing packets.  The iseq flag requires that all
              input packets are serialized.  The seq flag is equivalent to the
              combination iseq oseq.  It isn't work. Don't use it.

       dscp inherit
              (  only  IPv6 tunnels ) Inherit DS field between inner and outer
              header.

       encaplim ELIM
              ( only IPv6 tunnels ) set a fixed encapsulation limit.   Default
              is 4.

       flowlabel FLOWLABEL
              ( only IPv6 tunnels ) set a fixed flowlabel.

   ip tunnel prl - potential router list (ISATAP only)
       dev NAME
              mandatory device name.

       prl-default ADDR

       prl-nodefault ADDR

       prl-delete ADDR
              Add or delete ADDR as a potential router or default router.

   ip tunnel show - list tunnels
       This command has no arguments.

ip monitor and rtmon - state monitoring

       The  ip  utility can monitor the state of devices, addresses and routes
       continuously.  This option has a slightly  different  format.   Namely,
       the  monitor  command  is  the  first  in the command line and then the
       object list follows:

       ip monitor [ all | LISTofOBJECTS ]

       OBJECT-LIST is the list of object types that we want  to  monitor.   It
       may  contain link, address and route.  If no file argument is given, ip
       opens RTNETLINK, listens on it and dumps state changes  in  the  format
       described in previous sections.

       If a file name is given, it does not listen on RTNETLINK, but opens the
       file containing RTNETLINK messages saved in  binary  format  and  dumps
       them.   Such  a  history  file can be generated with the rtmon utility.
       This utility has a command line syntax similar to ip monitor.  Ideally,
       rtmon  should be started before the first network configuration command
       is issued. F.e. if you insert:

               rtmon file /var/log/rtmon.log

       in a startup script, you will be able to view the full history later.

       Certainly, it is possible to start rtmon at any time.  It prepends  the
       history with the state snapshot dumped at the moment of starting.

ip netns - process network namespace management

       A  network  namespace  is  logically another copy of the network stack,
       with it's own routes, firewall rules, and network devices.

       By  convention  a   named   network   namespace   is   an   object   at
       /var/run/netns/NAME  that can be opened.  The file descriptor resulting
       from  opening  /var/run/netns/NAME  refers  to  the  specified  network
       namespace.   Holding  that  file  descriptor  open  keeps  the  network
       namespace alive.  The file descriptor can be  used  with  the  setns(2)
       system call to change the network namespace associated with a task.

       The  convention for network namespace aware applications is to look for
       global network configuration files first in  /etc/netns/NAME/  then  in
       /etc/.    For   example,   if   you   want   a   different  version  of
       /etc/resolv.conf for a network namespace used to isolate your  vpn  you
       would name it /etc/netns/myvpn/resolv.conf.

       ip netns exec automates handling of this configuration, file convention
       for  network  namespace  unaware  applications,  by  creating  a  mount
       namespace  and bind mounting all of the per network namespace configure
       files into their traditional location in /etc.

   ip netns list - show all of the named network namespaces
   ip netns add NAME - create a new named network namespace
   ip netns delete NAME - delete the name of a network namespace
   ip netns exec NAME cmd ... - Run cmd in the named network namespace

ip xfrm - transform configuration

       xfrm is an IP framework for transforming packets  (such  as  encrypting
       their payloads). This framework is used to implement the IPsec protocol
       suite (with the state object  operating  on  the  Security  Association
       Database,  and  the  policy  object  operating  on  the Security Policy
       Database). It is also used for the IP Payload Compression Protocol  and
       features of Mobile IPv6.

   ip xfrm state add - add new state into xfrm
   ip xfrm state update - update existing state in xfrm
   ip xfrm state allocspi - allocate an SPI value
   ip xfrm state delete - delete existing state in xfrm
   ip xfrm state get - get existing state in xfrm
   ip xfrm state deleteall - delete all existing state in xfrm
   ip xfrm state list - print out the list of existing state in xfrm
   ip xfrm state flush - flush all state in xfrm
   ip xfrm state count - count all existing state in xfrm
       ID     is specified by a source address, destination address, transform
              protocol XFRM-PROTO, and/or Security Parameter Index SPI.

       XFRM-PROTO
              specifies a transform  protocol:  IPsec  Encapsulating  Security
              Payload  (esp),  IPsec  Authentication  Header  (ah), IP Payload
              Compression (comp), Mobile IPv6 Type 2 Routing Header  (route2),
              or Mobile IPv6 Home Address Option (hao).

       ALGO-LIST
              specifies  one  or  more algorithms ALGO to use. Algorithm types
              include encryption (enc), authentication (auth),  authentication
              with  a  specified truncation length (auth-trunc), authenticated
              encryption with associated data (aead), and compression  (comp).
              For  each algorithm used, the algorithm type, the algorithm name
              ALGO-NAME, and the key ALGO-KEY must be specified. For aead, the
              Integrity  Check  Value length ALGO-ICV-LEN must additionally be
              specified.  For  auth-trunc,  the  signature  truncation  length
              ALGO-TRUNC-LEN must additionally be specified.

       MODE   specifies a mode of operation: IPsec transport mode (transport),
              IPsec tunnel mode (tunnel), Mobile IPv6 route optimization  mode
              (ro),  Mobile  IPv6  inbound trigger mode (in_trigger), or IPsec
              ESP Bound End-to-End Tunnel Mode (beet).

       FLAG-LIST
              contains one or more of the  following  optional  flags:  noecn,
              decap-dscp, nopmtudisc, wildrecv, icmp, af-unspec, or align4.

       SELECTOR
              selects the traffic that will be controlled by the policy, based
              on the source address,  the  destination  address,  the  network
              device, and/or UPSPEC.

       UPSPEC selects  traffic  by  protocol.  For the tcp, udp, sctp, or dccp
              protocols, the source and destination  port  can  optionally  be
              specified.    For   the   icmp,  ipv6-icmp,  or  mobility-header
              protocols,  the  type  and  code  numbers  can   optionally   be
              specified.   For  the  gre  protocol,  the key can optionally be
              specified as a dotted-quad or number.  Other  protocols  can  be
              selected by name or number PROTO.

       LIMIT-LIST
              sets limits in seconds, bytes, or numbers of packets.

       ENCAP  encapsulates  packets with protocol espinudp or espinudp-nonike,
              using source port SPORT, destination port DPORT ,  and  original
              address OADDR.

   ip xfrm policy add - add a new policy
   ip xfrm policy update - update an existing policy
   ip xfrm policy delete - delete an existing policy
   ip xfrm policy get - get an existing policy
   ip xfrm policy deleteall - delete all existing xfrm policies
   ip xfrm policy list - print out the list of xfrm policies
   ip xfrm policy flush - flush policies
   ip xfrm policy count - count existing policies
       SELECTOR
              selects the traffic that will be controlled by the policy, based
              on the source address,  the  destination  address,  the  network
              device, and/or UPSPEC.

       UPSPEC selects  traffic  by  protocol.  For the tcp, udp, sctp, or dccp
              protocols, the source and destination  port  can  optionally  be
              specified.    For   the   icmp,  ipv6-icmp,  or  mobility-header
              protocols,  the  type  and  code  numbers  can   optionally   be
              specified.   For  the  gre  protocol,  the key can optionally be
              specified as a dotted-quad or number.  Other  protocols  can  be
              selected by name or number PROTO.

       DIR    selects the policy direction as in, out, or fwd.

       CTX    sets the security context.

       PTYPE  can be main (default) or sub.

       ACTION can be allow (default) or block.

       PRIORITY
              is a number that defaults to zero.

       FLAG-LIST
              contains  one  or both of the following optional flags: local or
              icmp.

       LIMIT-LIST
              sets limits in seconds, bytes, or numbers of packets.

       TMPL-LIST
              is a template list  specified  using  ID,  MODE,  REQID,  and/or
              LEVEL.

       ID     is specified by a source address, destination address, transform
              protocol XFRM-PROTO, and/or Security Parameter Index SPI.

       XFRM-PROTO
              specifies a transform  protocol:  IPsec  Encapsulating  Security
              Payload  (esp),  IPsec  Authentication  Header  (ah), IP Payload
              Compression (comp), Mobile IPv6 Type 2 Routing Header  (route2),
              or Mobile IPv6 Home Address Option (hao).

       MODE   specifies a mode of operation: IPsec transport mode (transport),
              IPsec tunnel mode (tunnel), Mobile IPv6 route optimization  mode
              (ro),  Mobile  IPv6  inbound trigger mode (in_trigger), or IPsec
              ESP Bound End-to-End Tunnel Mode (beet).

       LEVEL  can be required (default) or use.

   ip xfrm monitor - state monitoring for xfrm objects
       The xfrm objects to monitor can be optionally specified.

HISTORY

       ip was written by Alexey N. Kuznetsov and added in Linux 2.2.

SEE ALSO

       tc(8)
       IP Command reference ip-cref.ps
       IP tunnels ip-cref.ps
       User documentation at http://lartc.org/, but please  direct  bugreports
       and patches to: <netdev@vger.kernel.org>

AUTHOR

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