263486c97b
If enabled, check for a duplicated link-local address and abort enabling as per RFC 4862, section 5.4.5. If allowed to enable, perform DAD on the tentative addresses. Taken from FreeBSD.
275 lines
7.3 KiB
Groff
275 lines
7.3 KiB
Groff
.\" $NetBSD: ndp.8,v 1.26 2014/03/20 13:34:35 roy Exp $
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.\" $KAME: ndp.8,v 1.33 2005/10/19 14:57:42 suz 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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.Dd March 20, 2014
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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 ndp
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.Op Fl nt
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.Ar hostname
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.Nm ndp
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.Op Fl nt
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.Fl a | Fl c | Fl p
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.Nm ndp
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.Op Fl nt
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.Fl r
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.Nm ndp
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.Op Fl nt
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.Fl H | Fl P | Fl R
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.Nm ndp
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.Op Fl nt
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.Fl A Ar wait
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.Nm ndp
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.Op Fl nt
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.Fl d Ar hostname
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.Nm ndp
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.Op Fl nt
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.Fl f Ar filename
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.Nm ndp
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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 ndp
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.Op Fl nt
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.Fl I Op Ar interface | Li delete
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.Nm ndp
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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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command manipulates the address mapping table
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used by the Neighbor Discovery Protocol (NDP).
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.Bl -tag -width Ds
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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 NeighborXX
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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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.Pq 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
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.Ar interface
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to be used when there is no interface specified even though required.
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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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.Pp
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.Bl -tag -width Ds -compact
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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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Note that the kernel does not accept Router Advertisement messages,
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even if the flag
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.Ic accept_rtadv
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is on, unless either the
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.Li net.inet6.ip6.accept_rtadv
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variable is non-0, or the flag
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.Ic override_rtadv
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is on.
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This flag is set to 1 by default.
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.It Ic override_rtadv
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Specify whether or not to override the
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.Li net.inet6.ip6.accept_rtadv
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variable.
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If the flag is on, then it will suffice to set the flag
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.Ic accept_rtadv
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to make the kernel accept Router Advertisement messages on the
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.Ar interface .
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This flag is set to 0 by default.
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.It Ic prefer_source
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Prefer addresses on the
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.Ar interface
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as candidates of the source address for outgoing packets.
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The default value of this flag is off.
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For more details about the entire algorithm of source address
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selection, see the
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.Pa IMPLEMENTATION
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file supplied with the KAME kit.
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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 and any IPv6 addresses
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on the interface are marked as
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.Dq tentative .
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When the disabled flag is cleared, DAD will be performed.
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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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While the flag can be set or cleared by hand with the
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.Nm
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command, it is not generally advisable to modify this flag manually.
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.It Ic basereachable=(number)
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Specify the BaseReachbleTimer on the interface in millisecond.
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.It Ic retrans=(number)
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Specify the RetransTimer on the interface in millisecond.
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.It Ic curhlim=(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 on each entry,
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making it possible to merge output with
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.Xr tcpdump 8 .
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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 RETURN VALUES
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The
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.Nm
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command will exit with 0 on success, and non-zero on errors.
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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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command first appeared in the WIDE Hydrangea IPv6 protocol stack kit.
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.\"
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.\" .Sh BUGS
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.\" (to be written)
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