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NDP(8)			  BSD System Manager's Manual			NDP(8)

     ndp — control/diagnose IPv6 neighbor discovery protocol

     ndp [-nt] hostname
     ndp [-nt] -a | -c | -p
     ndp [-nt] -r
     ndp [-nt] -H | -P | -R
     ndp [-nt] -A wait
     ndp [-nt] -d hostname
     ndp [-nt] -f filename
     ndp [-nt] -i interface [expressions ...]
     ndp [-nt] -I [interface | delete]
     ndp [-nt] -s nodename etheraddr [temp] [proxy]

     The ndp utility manipulates the address mapping table used by the Neigh‐
     bor Discovery Protocol (NDP).

     -a	     Dump the currently existing NDP entries.  The following informa‐
	     tion will be printed:

	     Neighbor  IPv6 address of the neighbor.

	     Linklayer Address
		       Linklayer address of the neighbor.  It could be
		       “(incomplete)” when the address is not available.

	     Netif     Network interface associated with the neighbor cache

	     Expire    The time until expiry of the entry.  The entry could
		       become “permanent”, in which case it will never expire.

	     S	       State of the neighbor cache entry, as a single letter:

		       N       Nostate
		       W       Waitdelete
		       I       Incomplete
		       R       Reachable
		       S       Stale
		       D       Delay
		       P       Probe
		       ?       Unknown state (should never happen).

	     Flags     Flags on the neighbor cache entry, in a single letter.
		       They are: Router, proxy neighbor advertisement (“p”).
		       The field could be followed by a decimal number, which
		       means the number of NS probes the node has sent during
		       the current state.

     -A wait
	     Repeat -a (dump NDP entries) every wait seconds.

     -c	     Erase all the NDP entries.

     -d	     Delete specified NDP entry.

     -f	     Parse the file specified by filename.

     -H	     Harmonize consistency between the routing table and the default
	     router list; install the top entry of the list into the kernel
	     routing table.

     -I	     Shows the default interface used as the default route when there
	     is no default router.

     -I interface
	     Specifies the default interface used as the default route when
	     there is no default router.  The interface will be used as the

     -I delete
	     The current default interface will be deleted from the kernel.

     -i interface [expressions ...]
	     View ND information for the specified interface.  If additional
	     arguments expressions are given, ndp sets or clears the flags or
	     variables for the interface as specified in the expression.  Each
	     expression should be separated by white spaces or tab characters.
	     Possible expressions are as follows.  Some of the expressions can
	     begin with the special character ‘-’, which means the flag speci‐
	     fied in the expression should be cleared.	Note that you need --
	     before -foo in this case.

	     nud     Turn on or off NUD (Neighbor Unreachability Detection) on
		     the interface.  NUD is usually turned on by default.

		     Specify whether or not to accept Router Advertisement
		     messages received on the interface.  Note that the kernel
		     does not accept Router Advertisement messages unless the
		     net.inet6.ip6.accept_rtadv variable is non-0, even if the
		     flag is on.  This flag is set to 1 by default.

		     Prefer addresses on the interface as candidates of the
		     source address for outgoing packets.  The default value
		     of this flag is off.  For more details about the entire
		     algorithm of source address selection, see the
		     IMPLEMENTATION file supplied with the KAME kit.

		     Disable IPv6 operation on the interface.  When disabled,
		     the interface discards any IPv6 packets received on or
		     being sent to the interface.  In the sending case, an
		     error of ENETDOWN will be returned to the application.
		     This flag is typically set automatically in the kernel as
		     a result of a certain failure of Duplicate Address Detec‐
		     tion.  While the flag can be set or cleared by hand with
		     the ndp command, it is not generally advisable to modify
		     this flag manually.

		     Specify the BaseReachbleTimer on the interface in mil‐

		     Specify the RetransTimer on the interface in millisecond.

		     Specify the Cur Hop Limit on the interface.

     -n	     Do not try to resolve numeric addresses to hostnames.

     -p	     Show prefix list.

     -P	     Flush all the entries in the prefix list.

     -r	     Show default router list.

     -R	     Flush all the entries in the default router list.

     -s	     Register an NDP entry for a node.	The entry will be permanent
	     unless the word temp is given in the command.  If the word proxy
	     is given, this system will act as a proxy NDP server, responding
	     to requests for hostname even though the host address is not its

     -t	     Print timestamp on each entry, making it possible to merge output
	     with tcpdump(1).  Most useful when used with -A.

     The ndp utility exits 0 on success, and >0 if an error occurs.


     The ndp utility first appeared in the WIDE Hydrangea IPv6 protocol stack

BSD				 May 17, 1998				   BSD

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