ip-neighbour man page on ElementaryOS

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IP-NEIGHBOUR(8)			     Linux		       IP-NEIGHBOUR(8)

NAME
       ip-neighbour - neighbour/arp tables management.

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
	      '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 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.

       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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