\"      $NetBSD: ndp.8,v 1.33 2021/09/19 11:37:01 andvar Exp $
\"      $KAME: ndp.8,v 1.33 2005/10/19 14:57:42 suz Exp $
\"
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Dd September 15, 2020
Dt NDP 8
Os
\"
Sh NAME
Nm ndp
Nd control/diagnose IPv6 neighbor discovery protocol
\"
Sh SYNOPSIS
Nm ndp
Op Fl nt
Ar hostname
Nm ndp
Op Fl nt
Fl a | Fl c
Nm ndp
Op Fl nt
Fl A Ar wait
Nm ndp
Op Fl nt
Fl d Ar hostname
Nm ndp
Op Fl nt
Fl f Ar filename
Nm ndp
Op Fl nt
Fl i
Ar interface
Op Ar expressions ...
Nm ndp
Op Fl nt
Fl s Ar nodename etheraddr
Op Li temp
Op Li proxy
\"
Sh DESCRIPTION
The
Nm
command manipulates the address mapping table
used by the Neighbor Discovery Protocol (NDP).
Bl -tag -width Ds
It Fl A Ar wait
Repeat
Fl a
Pq dump NDP entries
every
Ar wait
seconds.
It Fl a
Dump the currently existing NDP entries.
The following information will be printed:
Bl -tag -width NeighborXX
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 D
Delay
It I
Incomplete
It N
Nostate
It P
Probe
It R
Reachable
It S
Stale
It U
Unreachable
It W
Waitdelete
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 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 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.
\"
Pp
Bl -tag -width Ds -compact
It Ic nud
Turn on or off NUD (Neighbor Unreachability Detection) on the
interface.
NUD is usually turned on by default.
It Ic auto_linklocal
Specify whether or not to perform automatic link-local address configuration on
Ar interface .
This flag is set by
Li 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 and any IPv6 addresses
on the interface are marked as
Dq tentative .
When the disabled flag is cleared, DAD will be performed.
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.
While the flag can be set or cleared by hand with the
Nm
command, it is not generally advisable to modify this flag manually.
It Ic basereachable=(number)
Specify the BaseReachableTimer on the interface in millisecond.
It Ic retrans=(number)
Specify the RetransTimer on the interface in millisecond.
It Ic curhlim=(number)
Specify the Cur Hop Limit on the interface.
El
It Fl n
Do not try to resolve numeric addresses to hostnames.
It Fl s
Register an NDP entry for a node.
The entry will be permanent unless the word
Cm temp
is given in the command.
If the word
Cm 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 8 .
Most useful when used with
Fl A .
El
\"
Sh EXIT STATUS
The
Nm
command will exit with 0 on success, and non-zero on errors.
\"
Sh SEE ALSO
Xr arp 8
\"
Sh HISTORY
The
Nm
command first appeared in the WIDE Hydrangea IPv6 protocol stack kit.
\"
\" .Sh BUGS
\" (to be written)

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