ndp —
control/diagnose IPv6 neighbor
discovery protocol
ndp |
-I [delete |
interface] |
ndp |
-i interface
[flags...] |
ndp |
-s [-nt]
nodename ether_addr
[temp] [proxy] |
The ndp command manipulates the address
mapping table used by Neighbor Discovery Protocol (NDP).
-a- Dump the currently existing NDP entries.
-A
wait- Repeat
-a (dump NDP entries) every
wait seconds.
-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
[delete | interface]- Shows or specifies the default interface used as the default route when
there is no default router. If no argument is given to the option, the
current default interface will be shown. If an
interface is specified, the interface will be used
as the default. If a special keyword
delete is
specified, 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. Possible flags are as
follows. All of the flags can begin with the special character
‘-’, which means the flag should be
cleared.
nud- turn on or off NUD (Neighbor Unreachability Detection) on the
interface. NUD is usually turned on by default.
disabled- IPv6 can be disabled separately from other network protocols. This
flag can be turned on automatically when Duplicate Address Detection
(DAD) indicates that another device on the network is using the same
link-local address.
proxy_prefixes- the interface is enabled to proxy neighbor discovery for global scope
prefixes matching those on link at other interfaces.
insecure
do not use cryptographically generated addresses (CGA) on this
interface.-
replicated
Address autoconfiguration proceeds under the assumption that interface
configuration is replicated by a sleep proxy at another node on the
link. Disables optimistic DAD and sends unsolicited NA with O=1 when DAD
completes. Ignores DAD failures from other hardware addresses.-
-l- Show link-layer reachability information.
-n- Do not try to resolve numeric address to hostname.
-p- Show prefix list.
-P- Flush all the entries in the prefix list.
-r- Show default router list.
-R- Flush all the entries in the default router list.
-s- Register an NDP entry for a node. The entry will be permanent unless the
word
temp is given in the command. If the word
proxy is given, this system will act as an proxy
NDP server, responding to requests for hostname even
though the host address is not its own.
-t- Print timestamp on each entries, to make it possible to merge output with
tcpdump(1). Most useful when used with
-A.
-x- Show extended link-layer reachability information in addition to that
shown by the
-l flag.
-w- Show the cryptographically generated address (CGA) parameters for the
node.
The ndp command will exit with 0 on
success, and non-zero on errors.
The ndp command first appeared in WIDE
Hydrangea IPv6 protocol stack kit.