e33acd92c3
It stops treating the address on the interface as special by source address selection rule even when the interface is outgoing interface. This is desired in some situation. Requested by: hrs Reviewed by: IHANet folks including hrs MFC after: 1 week
267 lines
6.8 KiB
Groff
267 lines
6.8 KiB
Groff
.\" $KAME: ndp.8,v 1.28 2002/07/17 08:46:33 itojun Exp $
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.\"
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.\" Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the project nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd Jan 10, 2013
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.Dt NDP 8
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.Os
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.\"
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.Sh NAME
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.Nm ndp
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.Nd control/diagnose IPv6 neighbor discovery protocol
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.\"
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.Sh SYNOPSIS
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.Nm
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.Op Fl nt
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.Ar hostname
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.Nm
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.Op Fl nt
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.Fl a | c | p
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.Nm
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.Op Fl nt
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.Fl r
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.Nm
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.Op Fl nt
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.Fl H | P | R
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.Nm
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.Op Fl nt
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.Fl A Ar wait
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.Nm
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.Op Fl nt
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.Fl d Ar hostname
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.Nm
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.Op Fl nt
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.Fl f Ar filename
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.Nm
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.Op Fl nt
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.Fl i
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.Ar interface
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.Op Ar expressions ...
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.Nm
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.Op Fl nt
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.Fl I Op Ar interface | Li delete
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.Nm
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.Op Fl nt
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.Fl s Ar nodename etheraddr
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.Op Li temp
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.Op Li proxy
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.\"
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.Sh DESCRIPTION
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The
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.Nm
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utility manipulates the address mapping table
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used by the Neighbor Discovery Protocol (NDP).
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.Bl -tag -width indent
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.It Fl a
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Dump the currently existing NDP entries.
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The following information will be printed:
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.Bl -tag -width "Neighbor"
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.It Neighbor
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IPv6 address of the neighbor.
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.It Linklayer Address
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Linklayer address of the neighbor.
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It could be
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.Dq Li (incomplete)
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when the address is not available.
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.It Netif
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Network interface associated with the neighbor cache entry.
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.It Expire
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The time until expiry of the entry.
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The entry could become
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.Dq Li permanent ,
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in which case it will never expire.
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.It S
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State of the neighbor cache entry, as a single letter:
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.Pp
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.Bl -tag -width indent -compact
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.It N
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Nostate
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.It W
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Waitdelete
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.It I
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Incomplete
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.It R
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Reachable
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.It S
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Stale
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.It D
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Delay
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.It P
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Probe
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.It ?\&
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Unknown state (should never happen).
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.El
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.It Flags
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Flags on the neighbor cache entry, in a single letter.
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They are: Router, proxy neighbor advertisement
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.Pq Dq p .
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The field could be followed by a decimal number,
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which means the number of NS probes the node has sent during the current state.
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.El
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.It Fl A Ar wait
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Repeat
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.Fl a
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(dump NDP entries)
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every
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.Ar wait
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seconds.
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.It Fl c
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Erase all the NDP entries.
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.It Fl d
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Delete specified NDP entry.
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.It Fl f
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Parse the file specified by
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.Ar filename .
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.It Fl H
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Harmonize consistency between the routing table and the default router
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list; install the top entry of the list into the kernel routing table.
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.It Fl I
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Shows the default interface used as the default route when
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there is no default router.
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.It Fl I Ar interface
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Specifies the default interface used as the default route when
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there is no default router.
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The
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.Ar interface
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will be used as the default.
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.It Fl I Li delete
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The current default interface will be deleted from the kernel.
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.It Fl i Ar interface Op Ar expressions ...
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View ND information for the specified interface.
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If additional arguments
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.Ar expressions
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are given,
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.Nm
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sets or clears the flags or variables for the interface as specified in
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the expression.
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Each expression should be separated by white spaces or tab characters.
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Possible expressions are as follows.
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Some of the expressions can begin with the
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special character
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.Ql - ,
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which means the flag specified in the expression should be cleared.
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Note that you need
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.Fl -
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before
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.Fl foo
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in this case.
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.\"
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.Bl -tag -width indent
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.It Ic nud
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Turn on or off NUD (Neighbor Unreachability Detection) on the
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interface.
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NUD is usually turned on by default.
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.It Ic accept_rtadv
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Specify whether or not to accept Router Advertisement messages
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received on the
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.Ar interface .
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This flag is set by
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.Va net.inet6.ip6.accept_rtadv
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sysctl variable.
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.It Ic auto_linklocal
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Specify whether or not to perform automatic link-local address configuration
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on
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.Ar interface .
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This flag is set by
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.Va net.inet6.ip6.auto_linklocal
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sysctl variable.
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.It Ic no_prefer_iface
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The address on the outgoing interface is preferred by source addess
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selection rule.
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If this flag is set, stop treating the address on the
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.Ar interface
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as special even when the
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.Ar interface
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is outgoing interface.
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The default value of this flag is off.
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.It Ic disabled
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Disable IPv6 operation on the interface.
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When disabled, the interface discards any IPv6 packets
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received on or being sent to the interface.
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In the sending case, an error of ENETDOWN will be returned to the
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application.
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This flag is typically set automatically in the kernel as a result of
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a certain failure of Duplicate Address Detection.
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If the auto_linklocal per-interface flag is set, automatic link-local
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address configuration is performed again when this flag is cleared.
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.It Ic basereachable Ns Li = Ns Pq Ar number
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Specify the BaseReachbleTimer on the interface in millisecond.
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.It Ic retrans Ns Li = Ns Pq Ar number
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Specify the RetransTimer on the interface in millisecond.
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.It Ic curhlim Ns Li = Ns Pq Ar number
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Specify the Cur Hop Limit on the interface.
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.El
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.It Fl n
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Do not try to resolve numeric addresses to hostnames.
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.It Fl p
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Show prefix list.
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.It Fl P
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Flush all the entries in the prefix list.
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.It Fl r
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Show default router list.
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.It Fl R
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Flush all the entries in the default router list.
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.It Fl s
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Register an NDP entry for a node.
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The entry will be permanent unless the word
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.Li temp
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is given in the command.
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If the word
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.Li proxy
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is given, this system will act as a proxy NDP server,
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responding to requests for
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.Ar hostname
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even though the host address is not its own.
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.It Fl t
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Print timestamp for each entry,
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to make it possible to merge the output with
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.Xr tcpdump 1 .
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Most useful when used with
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.Fl A .
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.El
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.\"
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.Sh EXIT STATUS
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.Ex -std
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.\"
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.Sh SEE ALSO
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.Xr arp 8
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.\"
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.Sh HISTORY
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The
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.Nm
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utility first appeared in the WIDE Hydrangea IPv6 protocol stack kit.
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The
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.Fl I Ar auto_linklocal
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flag first appeared in
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.Fx 8.0 .
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.\"
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.\" .Sh BUGS
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.\" (to be written)
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