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-.\" $KAME: ndp.8,v 1.28 2002/07/17 08:46:33 itojun Exp $
-.\"
-.\" Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\" notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\" notice, this list of conditions and the following disclaimer in the
-.\" documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the project nor the names of its contributors
-.\" may be used to endorse or promote products derived from this software
-.\" without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd September 2, 2009
-.Dt NDP 8
-.Os
-.\"
-.Sh NAME
-.Nm ndp
-.Nd control/diagnose IPv6 neighbor discovery protocol
-.\"
-.Sh SYNOPSIS
-.Nm
-.Op Fl nt
-.Ar hostname
-.Nm
-.Op Fl nt
-.Fl a | c | p
-.Nm
-.Op Fl nt
-.Fl r
-.Nm
-.Op Fl nt
-.Fl H | P | R
-.Nm
-.Op Fl nt
-.Fl A Ar wait
-.Nm
-.Op Fl nt
-.Fl d Ar hostname
-.Nm
-.Op Fl nt
-.Fl f Ar filename
-.Nm
-.Op Fl nt
-.Fl i
-.Ar interface
-.Op Ar expressions ...
-.Nm
-.Op Fl nt
-.Fl I Op Ar interface | Li delete
-.Nm
-.Op Fl nt
-.Fl s Ar nodename etheraddr
-.Op Li temp
-.Op Li proxy
-.\"
-.Sh DESCRIPTION
-The
-.Nm
-utility manipulates the address mapping table
-used by the Neighbor Discovery Protocol (NDP).
-.Bl -tag -width indent
-.It Fl a
-Dump the currently existing NDP entries.
-The following information will be printed:
-.Bl -tag -width "Neighbor"
-.It Neighbor
-IPv6 address of the neighbor.
-.It Linklayer Address
-Linklayer address of the neighbor.
-It could be
-.Dq Li (incomplete)
-when the address is not available.
-.It Netif
-Network interface associated with the neighbor cache entry.
-.It Expire
-The time until expiry of the entry.
-The entry could become
-.Dq Li permanent ,
-in which case it will never expire.
-.It S
-State of the neighbor cache entry, as a single letter:
-.Pp
-.Bl -tag -width indent -compact
-.It N
-Nostate
-.It W
-Waitdelete
-.It I
-Incomplete
-.It R
-Reachable
-.It S
-Stale
-.It D
-Delay
-.It P
-Probe
-.It ?\&
-Unknown state (should never happen).
-.El
-.It Flags
-Flags on the neighbor cache entry, in a single letter.
-They are: Router, proxy neighbor advertisement
-.Pq Dq 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.
-.El
-.It Fl A Ar wait
-Repeat
-.Fl a
-(dump NDP entries)
-every
-.Ar wait
-seconds.
-.It Fl c
-Erase all the NDP entries.
-.It Fl d
-Delete specified NDP entry.
-.It Fl f
-Parse the file specified by
-.Ar filename .
-.It Fl H
-Harmonize consistency between the routing table and the default router
-list; install the top entry of the list into the kernel routing table.
-.It Fl I
-Shows the default interface used as the default route when
-there is no default router.
-.It Fl I Ar interface
-Specifies the default interface used as the default route when
-there is no default router.
-The
-.Ar interface
-will be used as the default.
-.It Fl I Li delete
-The current default interface will be deleted from the kernel.
-.It Fl i Ar interface Op Ar expressions ...
-View ND information for the specified interface.
-If additional arguments
-.Ar expressions
-are given,
-.Nm
-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
-.Ql - ,
-which means the flag specified in the expression should be cleared.
-Note that you need
-.Fl -
-before
-.Fl foo
-in this case.
-.\"
-.Bl -tag -width indent
-.It Ic nud
-Turn on or off NUD (Neighbor Unreachability Detection) on the
-interface.
-NUD is usually turned on by default.
-.It Ic accept_rtadv
-Specify whether or not to accept Router Advertisement messages
-received on the
-.Ar interface .
-This flag is set by
-.Va net.inet6.ip6.accept_rtadv
-sysctl variable.
-.It Ic auto_linklocal
-Specify whether or not to perform automatic link-local address configuration
-on
-.Ar interface .
-This flag is set by
-.Va net.inet6.ip6.auto_linklocal
-sysctl variable.
-.It Ic prefer_source
-Prefer addresses on the
-.Ar 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
-.Pa IMPLEMENTATION
-file supplied with the KAME kit.
-.It Ic disabled
-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 Detection.
-If the auto_linklocal per-interface flag is set, automatic link-local
-address configuration is performed again when this flag is cleared.
-.It Ic basereachable Ns Li = Ns Pq Ar number
-Specify the BaseReachbleTimer on the interface in millisecond.
-.It Ic retrans Ns Li = Ns Pq Ar number
-Specify the RetransTimer on the interface in millisecond.
-.It Ic curhlim Ns Li = Ns Pq Ar number
-Specify the Cur Hop Limit on the interface.
-.El
-.It Fl n
-Do not try to resolve numeric addresses to hostnames.
-.It Fl p
-Show prefix list.
-.It Fl P
-Flush all the entries in the prefix list.
-.It Fl r
-Show default router list.
-.It Fl R
-Flush all the entries in the default router list.
-.It Fl s
-Register an NDP entry for a node.
-The entry will be permanent unless the word
-.Li temp
-is given in the command.
-If the word
-.Li proxy
-is given, this system will act as a proxy NDP server,
-responding to requests for
-.Ar hostname
-even though the host address is not its own.
-.It Fl t
-Print timestamp on each entry,
-making it possible to merge output with
-.Xr tcpdump 1 .
-Most useful when used with
-.Fl A .
-.El
-.\"
-.Sh EXIT STATUS
-.Ex -std
-.\"
-.Sh SEE ALSO
-.Xr arp 8
-.\"
-.Sh HISTORY
-The
-.Nm
-utility first appeared in the WIDE Hydrangea IPv6 protocol stack kit.
-The
-.Fl I Ar auto_linklocal
-flag first appeared in
-.Fx 8.0 .
-.\"
-.\" .Sh BUGS
-.\" (to be written)
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