NDP(8) BSD System Manager's Manual NDP(8)NAMEndp - control/diagnose IPv6 Neighbor Discovery Protocol (NDP)
SYNOPSISndp [-nt] hostname
ndp [-nt] -a | -c | -p
ndp [-nt] -r
ndp [-nt] -H | -P | -R
ndp [-nt] -A wait
ndp [-nt] -d hostname
ndp [-nt] -f filename
ndp [-nt] -i interface [flags ...]
ndp [-nt] -I [interface | delete]
ndp [-nt] -s nodename etheraddr [temp] [proxy]
DESCRIPTION
The ndp command manipulates the address mapping table used by the Neigh-
bor Discovery Protocol (NDP).
-A wait
Repeat -a (dump NDP entries) every wait seconds.
-a Dump the currently existing NDP entries. The following informa-
tion will be printed:
Neighbor IPv6 address of the neighbor.
Linklayer Address
Linklayer address of the neighbor. It could be
"(incomplete)" when the address is not available.
Netif Network interface associated with the neighbor cache
entry.
Expire The time until expiry of the entry. The entry could
become "permanent", in which case it will never ex-
pire.
S State of the neighbor cache entry, as a single
letter:
N Nostate
W Waitdelete
I Incomplete
R Reachable
S Stale
D Delay
P Probe
? Unknown state (should never happen).
Flags Flags on the neighbor cache entry, in a single
letter. They are: Router, proxy neighbor advertise-
ment ("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.
-c Erase all the NDP entries.
-d Delete specified NDP entry.
-f Parse the file specified by filename.
-H Harmonize consistency between the routing table and the default
router list; install the top entry of the list into the kernel
routing table.
-I Shows the default interface used as the default route when there
is no default router.
-I interface
Specifies the default interface to be used when there is no in-
terface specified even though required.
-I delete
The current default interface will be deleted from the kernel.
-i interface [flags ...]
View ND information for the specified interface. If additional
arguments flags are given, ndp sets or clears the specified flags
for the interface. Each flag should be separated by whitespace or
tab characters. Possible flags are as follows. All of the flags
can begin with the special character '-', which means the flag
should be cleared. Note that you need -- before -foo in this
case.
nud Turn on or off NUD (Neighbor Unreachability Detection) on
the interface. NUD is usually turned on by default.
accept_rtadv
Specify whether or not to accept Router Advertisement
messages received on the interface. Note that the kernel
does not accept Router Advertisement messages unless the
net.inet6.ip6.accept_rtadv variable is non-0, even if the
flag is on. This flag is set to 1 by default. See
sysctl(8) and sysctl.conf(5) for further details on how
to set the net.inet6.ip6.accept_rtadv variable.
-n Do not try to resolve numeric addresses to hostnames.
-P Flush all the entries in the prefix list.
-p Show prefix list.
-R Flush all the entries in the default router list.
-r Show default router list.
-s Register a NDP entry for a node. The entry will be permanent un-
less the word temp is given in the command. If the word proxy is
given, this system will act as a proxy NDP server, responding to
requests for hostname even though the host address is not its
own.
-t Print timestamp on each entry, making it possible to merge output
with tcpdump(8). Most useful when used with -A.
RETURN VALUES
The ndp command exits with 0 on success, and non-zero on errors.
SEE ALSOip6(4), sysctl.conf(5), arp(8), sysctl(8), tcpdump(8)HISTORY
The ndp command first appeared in the WIDE Hydrangea IPv6 protocol stack
kit.
MirOS BSD #10-current May 17, 1998 1
