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Commands Reference, Volume 4

ndpd-host Daemon


NDP daemon for an host.


ndpd-host [ -d] [ -v] [ -t]


The ndpd-host command manages the Neighbor Discovery Protocol (NDP) for non-kernel activities: Router Discovery, Prefix Discovery, Parameter Discovery and Redirects. The ndpd-host command deals with the default route, including default router, default interface and default interface address.


The ndpd-host command knows about IEEE and CTI point to point interfaces. The ndpd-host command exchanges packets on all the known interfaces UP with a Link-Local Address. Any change of status of an interface is detected. If an interface goes down or loses its Link-Local address, the NDP processing is stopped on this interface. If an interface goes up, the NDP processing is started.

The IEEE interfaces are configured using the autoconf6 command. The PPP interfaces are configured using the pppd daemon. The token negotiation defines the Link-Local addresses. In order to send Router Advertisements over a CTI configured tunnel, it must have local and distant Link-Local addresses.

Note: For all the up point to point interfaces, ndpd-host sets a local route via lo0 for local addresses.


-d Enables debugging (exceptional conditions and dump).
-v Logs all interesting events (daemon.info and console).
-t Adds a time stamp in each log.


SIGUSR1 Turns on verbose.
SIGUSR2 Turns off verbose.
SIGINT Dumps the current state of ndpd-host to syslog or stdout.
SIGTERM Cleans up ndpd-host and exits.

Related Information

The ifconfig command, route command, autoconf6 command, and the ndpd-router command.

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