ip-neighbour


SYNOPSIS
       ip [ OPTIONS ] neigh  { COMMAND | help }


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

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



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.


       nud NUD_STATE
              the state of the neighbour entry.  nud is an abbreviation for
              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 command displays neighbour tables.


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


       dev NAME
              only list the neighbours attached to this device.


       proxy  list neighbour proxies.


       unused only list neighbours which are not currently in use.


       nud NUD_STATE
              only list neighbour entries in this state.  NUD_STATE takes val-
              ues 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.

              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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