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ip-neighbour


SYNOPSIS

       ip [ OPTIONS ] neigh  { COMMAND | help }

       ip neigh { add | del | change | replace } { ADDR [ lladdr LLADDR ] [
               nud STATE ] | proxy ADDR } [ dev DEV ]

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

       STATE := { permanent | noarp | stale | reachable | none | incomplete |
               delay | probe | failed }


DESCRIPTION

       The ip neigh command manipulates neighbour objects that establish bind-
       ings between protocol addresses and link layer addresses for hosts
       sharing the same link.  Neighbour entries are organized into tables.
       The IPv4 neighbour table is also known by another name - the ARP table.

       The corresponding commands display neighbour bindings and their proper-
       ties, 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.

                     reachable
                            the neighbour entry is valid until the reachabil-
                            ity 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.

                     none   this is a pseudo state used when initially creat-
                            ing a neighbour entry or after trying to remove it
                            before it becomes free to do so.

                     incomplete
                            the neighbour entry has not (yet) been vali-
                            dated/resolved.

                     delay  neighbor entry validation is currently delayed.

                     probe  neighbor is being probed.

                     failed max number of probes exceeded without success,
                            neighbor validation has ultimately failed.

       ip neighbour delete
              delete 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

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

              dev NAME
                     only list the neighbours attached to this device.

              proxy  list neighbour proxies.

              are that it does not run when no arguments are given, and that
              the default neighbour states to be flushed do not include perma-
              nent 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.


EXAMPLES

       ip neighbour
              Shows the current neighbour table in kernel.

       ip neigh flush dev eth0
              Removes entries in the neighbour table on device eth0.


SEE ALSO

       ip(8)


AUTHOR

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


iproute2 20 Dec 2011 IP-NEIGHBOUR(8)



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