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ndp(1M)								       ndp(1M)

NAME
       ndp - IPv6 Neighbor Discovery cache display and control

SYNOPSIS
       host

       interface]

       interface] interval

       interface] host

       interface]

       interface]

       interface]

       interface host hw_addr

       filename

DESCRIPTION
       The  command displays and modifies the IPv6 Neighbor Discovery cache as
       specified in the IPv6 Neighbor Discovery (ND) protocol.

   Options
       recognizes the following options and arguments:

	      host	Display the current Neighbor Discovery	cache  entries
			for the host specified by host, which is either a name
			present in the hostname database (see hosts(4)), or an
			IPv6   address	 expressed   in	 colon	notation  (see
			inet6(3N)).

	      Select the Neighbor Discovery cache entries for the specified
			interface.  There is no	 distinction  between  primary
			and  secondary	interfaces.   Therefore, specifying is
			the same as specifying

	      Display host addresses in IPv6 colon notation.
			If this option is not specified, attempts  to  display
			host  addresses	 symbolically first, and falls back to
			displaying the host addresses in IPv6  colon  notation
			if that failed.

	      Display all Neighbor Discovery cache entries.

	      Continuously display all Neighbor Discovery cache entries,
			updated at each interval, measured in seconds.

	      Deletes Neighbor Discovery cache entries with
			IP addresses that are not associated with local inter‐
			faces for the host specified by host.

	      Flushes all Neighbor Discovery cache entries with
			IP addresses that are not associated with local inter‐
			faces.	 These	are entries with the (local) flag set.
			Refer to the section of this manpage  for  information
			about flags.

	      (Quiet)  Do not write anything to standard output.
			This option only applies to and options.

	      Display the prefix list in the Neighbor Discovery cache table.
			The  prefix  list  defines  a set of IP address ranges
			that the host can reach.  The prefix flags are for on-
			link,  and for autonomous.  The on-link flag indicates
			that  addresses	 with  that  prefix  can  be   reached
			directly  without going through a router.  The autono‐
			mous flag indicates that the prefix came  from	state‐
			less autoconfiguration.

	      Flushes all autoconfigured addresses learned from prefixes
			advertised by the Router Advertisement Messages.

	      Create a Neighbor Discovery cache entry for the
			interface  specified  by interface, the host specified
			by host, and the hardware address (link-layer address)
			specified  by  hw_addr.	  The  hw_addr is specified as
			where each x is a hexadecimal digit.

			If is specified, the entry is published,  which	 means
			that this system will respond to Neighbor Solicitation
			for the specified "host" even though the host  address
			is  not	 its  own.  If is specified, it means that the
			published entry refers to  an  anycast	address.  This
			parameter  can only be specified when the parameter is
			specified.

	      Create Neighbor Discovery cache entries from the
			specifications found in the file  specified  by	 file‐
			name.	Each  entry  in this file specifies the inter‐
			face, host, hw_addr, and  optionally  the  flag.   For
			example, the content of this file can be:

       The use of and options requires root privileges.

   Contents
       A Neighbor Discovery cache entry includes the following fields:

	      ·	 host (neighbor's host name or IP address)
	      ·	 hardware address (link layer address) of host
	      ·	 interface name
	      ·	 state
	      ·	 flags

       The state of an entry can be or

	      ·	 An  entry is in an state if address resolution is in progress
		 and the hardware address of the neighbor has not been	deter‐
		 mined.

	      ·	 An  entry is in a state if the neighbor is known to have been
		 reachable recently.

	      ·	 An entry is in a state if the neighbor is no longer known  to
		 be  reachable.	  However,  no attempt has been made to verify
		 its reachability because no traffic has  been	sent  to  this
		 neighbor.

	      ·	 An  entry is in a state if the neighbor is no longer known to
		 be reachable, and traffic  has	 recently  been	 sent  to  the
		 neighbor.

	      ·	 An  entry is in a state if the neighbor is no longer known to
		 be reachable, and unicast Neighbor Solicitation  probes  have
		 been sent to verify reachability.

       The  flags  can	be  (Deprecated),  (Local),  (Published), (Temporary),
       (Auto), or (anycast).  A deprecated address can be used	for  receiving
       packets,	 but  it  should  not  be used for sending packets because its
       validity is expected to expire soon.  The  local	 flag  indicates  that
       this Neighbor Discovery cache entry corresponds to an interface on this
       host.  The published flag indicates  that  the  host  will  respond  to
       Neighbor	 Solicitations	on this IPv6 address. The temporary flag indi‐
       cates that the address has a randomly  generated	 interface  identifier
       which  changes over time. The autonomous flag indicates that the prefix
       for the address came from  stateless  address  autoconfiguration.   The
       anycast flag indicates that the address is an anycast address.

DIAGNOSTICS
       returns a non-zero value to indicate errors.  A zero return value indi‐
       cates success.

EXAMPLES
       The following output shows the local interfaces and  the	 IP  addresses
       assigned to them.

	 Name	   Mtu Address/Prefix			    Ipkts    Opkts
	 lan1	  1500 fe80::210:83ff:fef7:3a21/10	      982      759
	 lan1:1	  1500 fec0::9:210:83ff:fef7:3a21/64		0	 0
	 lan3	  1500 fe80::210:83ff:fef7:7a9d/10		0	 0
	 lo0	  4136 ::1/128				       57	57

       To display the entire Neighbor Discovery cache:

	 Destination		    Physical Address  Interface State	  Flags
	 fe80::202:fdff:fe36:8720   0:2:fd:36:87:20   lan1	STALE	  -
	 fec0::9:210:83ff:fef7:3a21 0:10:83:f7:3a:21  lan1:1	REACHABLE LP
	 fe80::210:83ff:fef7:3a21   0:10:83:f7:3a:21  lan1	REACHABLE LP
	 fe80::210:83ff:fef7:7a9d   0:10:83:f7:7a:9d  lan3	REACHABLE LP

       To show Neighbor Discovery cache entries for a host:

	 Destination		    Physical Address  Interface State	  Flags
	 fe80::210:83ff:fef7:3a21   0:10:83:f7:3a:21  lan1	REACHABLE LP

       To show Neighbor Discovery cache entries for an interface:

	 Destination		    Physical Address  Interface State	  Flags
	 fe80::210:83ff:fef7:7a9d   0:10:83:f7:7a:9d  lan3	REACHABLE LP

       To  delete  a Neighbor Discovery cache entries for a host and an inter‐
       face:

	 fe80::202:fdff:fe36:8720 (fe80::202:fdff:fe36:8720) deleted.

       To show the prefix list:

	 Prefix List		  Interface  Valid     Preferred Flags
	  Entries			    Lifetime   Lifetime
	  fec0:0:0:9::/64	    lan1       167	 107	  A
	  fe80::/10		    lan1       inf	 inf	  LA
	  fe80::/10		    lan3       inf	 inf	  LA

       To add an entry in the Neighbor Discovery cache:

	 nodeb (2001::1) added.

	 Destination		    Physical Address  Interface State	  Flags
	 fe80::210:83ff:fef7:7a9d   0:10:83:f7:7a:9d  lan3	REACHABLE LP
	 2001::1		    0:1:2:3:4:5	      lan3	-	  -

       To flush all remote entries:

	 nodea (fe80::202:fdff:fe36:8720) flushed.
	 nodeb (2001::1) flushed.

AUTHOR
       was developed by HP.

SEE ALSO
       hosts(4), inet6(3N), ndp(7P).

       Neighbor Discovery for IP Version 6 (IPv6), RFC2461, Narten,  Nordmark,
       Simpson.

       IPv6 Stateless Address Autoconfiguration, RFC2462, Thomson, Narten.

								       ndp(1M)
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