in.ndpd(1M)						  System Administration Commands					       in.ndpd(1M)

NAME

       in.ndpd - daemon for IPv6 autoconfiguration

SYNOPSIS

       /usr/lib/inet/in.ndpd [-adt] [-f config_file]

DESCRIPTION

       in.ndpd	provides both the host and router autoconfiguration components of Neighbor Discovery for IPv6 and Stateless Address Autoconfigura-
       tion for IPv6. In particular, in.ndpd implements

	 o  router discovery;

	 o  prefix discovery;

	 o  parameter discovery;

	 o  address autoconfiguration; and

	 o  privacy extensions for stateless address autoconfiguration.

       Other aspects of Neighbor Discovery are implemented by ip6(7P), including:

	 o  address resolution;

	 o  neighbor unreachability detection; and

	 o  redirect.

       The duplicate address detection function is implemented by ifconfig(1M).

       If the /etc/inet/ndpd.conf file does not exist or does not set the variable AdvSendAdvertisements to true for  a  network  interface,  then
       in.ndpd	will  make  the  node a host for that interface, that is, sending router solicitation messages and then using router advertisement
       messages it receives to autoconfigure the node. Note that in.ndpd only autoconfigures the addresses of global or site-local scope from  the
       prefix advertisement.

       If  AdvSendAdvertisements  is  set to true for an interface, then in.ndpd will perform router functions on that interface, that is, sending
       router advertisement messages to autoconfigure the attached hosts, but not use any advertisements it receives for  autoconfiguration.  How-
       ever, when sending advertisements, in.ndpd will use the advertisements it sends itself to autoconfigure its prefixes.

       Stateless  autoconfiguration  requires  no  manual  configuration  of  hosts,  minimal (if any) configuration of routers, and no additional
       servers. The stateless mechanism enables a host to generate its own addresses and uses local information as well as  non-local  information
       that is advertised by routers to generate the addresses.

       Temporary  addresses that are autoconfigured for an interface can also be implemented. A temporary address token is enabled for one or more
       interfaces on a host. However, unlike standard, autoconfigured IPv6 addresses, a temporary address consists of the site prefix and  a  ran-
       domly generated 64 bit number.  This random number becomes the interface ID segment of the IPv6 address. A link-local address is not gener-
       ated with the temporary address as the interface ID.

       Routers advertise all prefixes that have been assigned on the link.  IPv6 hosts use Neighbor Discovery to obtain a  subnet  prefix  from  a
       local  router.	Hosts  automatically  create IPv6 addresses by combining the subnet prefix with an interface IDs that is generated from an
       interface's MAC address. In the absence of routers, a host can generate only link-local addresses. Link-local addresses can  only  be  used
       for communication with nodes on the same link.

       For information on how to enable IPv6 address autoconfiguration, see System Administration Guide: IP Services

OPTIONS

       -a	       Turn  off  stateless  address  auto  configuration.  When set, the daemon does not autoconfigure any addresses and does not
		       renumber any addresses. This option does the same thing as the following line in ndpd.conf(4):

		       ifdefault StatelessAddrConf off

       -d	       Turn on large amounts of debugging output on stdout. When set, the program runs in the foreground and stays attached to the
		       controlling terminal.

       -f  config_file Use config_file for configuration information instead of the default /etc/inet/ndpd.conf.

       -t	       Turn  on  tracing  (printing)  of  all sent and received packets tostdout. When set, the program runs in the foreground and
		       stays attached to the controlling terminal.

FILES

       /etc/inet/ndpd.conf     Configuration file. This file is not necessary on a host, but it is required on	a  router  to  enable  in.ndpd	to
			       advertise autoconfiguration information to the hosts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	     ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ifconfig(1M), ndpd.conf(4), attributes(5), icmp6(7P),ip6(7P), attributes(5)

       System Administration Guide: IP Services

       Narten, T., Nordmark, E., Simpson, W.RFC 2461, Neighbor Discovery for IP Version 6 (IPv6). The Internet Society. December 1998.

       Thomson, S., Narten, T. RFC 2462, IPv6 Stateless Address Autoconfiguration. The Internet Society. December 1998.

       Narten,	T.,  and  Draves,  R.  RFC 3041, Privacy Extensions for Stateless Address Autoconfiguration in IPv6. The Internet Society. January
       2001.

DIAGNOSTICS

       Receipt of a SIGHUP signal will make in.ndpd restart and reread /etc/inet/ndpd.conf.

SunOS 5.10							    18 Dec 2003 						       in.ndpd(1M)