NDP(8)

NAME
ndp - control/diagnose IPv6 neighbor discovery protocol

SYNOPSIS
ndp -a [-nt]
ndp -A wait [-nt]
ndp -c [-nt]
ndp -d [-nt] hostname
ndp -f [-nt] filename
ndp -H
ndp -I [delete | interface]
ndp -i interface [flags...]
ndp -p
ndp -P
ndp -r
ndp -R
ndp -s [-nt] nodename ether_addr [temp] [proxy]

DESCRIPTION
The ndp utility 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.
        accept_rtadv Specify whether or not to accept Router Advertisement messages received on the interface. This flag is set by the net.inet6.ip6.accept_rtadv sysctl variable.
        auto_linklocal Specify whether or not to perform automatic link-local address configuration on the interface. This flag is set by the net.inet6.ip6.auto_linklocal sysctl variable.

-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 a proxy NDP server, responding to requests for hostname even though the host address is not its own.

-t  Print timestamp for each entry, to make it possible to merge the output with tcpdump(1). Most useful when used with -A.

EXIT STATUS

SEE ALSO
arp(8)

HISTORY
The ndp utility first appeared in WIDE Hydrangea IPv6 protocol stack kit.