ip-neighbour man page on Alpinelinux

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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 time‐
		     out 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

	      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.

	      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 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 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 neigh‐
	      bours.

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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