in.ndpd man page on SmartOS

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IN.NDPD(1M)							   IN.NDPD(1M)

       in.ndpd - daemon for IPv6 autoconfiguration

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

       in.ndpd	provides both the host and router autoconfiguration components
       of Neighbor Discovery for IPv6 and Stateless and Stateful Address Auto‐
       configuration for IPv6. In particular, in.ndpd implements:

	   o	  router discovery;

	   o	  prefix discovery;

	   o	  parameter discovery;

	   o	  invocation of stateful address autoconfiguration;

	   o	  stateless address autoconfiguration; and

	   o	  privacy extensions for stateless address autoconfiguration.

       Other aspects of Neighbor Discovery are implemented by ip6(7P), includ‐

	   o	  address resolution;

	   o	  neighbor unreachability detection; and

	   o	  redirect.

       The duplicate address detection function is implemented by  the	system

       in.ndpd	is  managed by the service management facility (SMF), by means
       of the service identifier:


       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 mes‐
       sages 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. However,
       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. in.ndpd will plumb
       logical interfaces for each of these addresses.

       Stateful autoconfiguration involves the dhcpagent(1M)  daemon  and  the
       use  of	the  DHCPv6  protocol. The dhcpagent daemon is responsible for
       plumbing the logical interfaces for the acquired addresses, maintaining
       the leases, and handling duplicate addresses. in.ndpd starts the dhcpa‐
       gent daemon automatically and signals when DHCPv6  should  be  started.
       in.ndpd	also detects when dhcpagent configures the logical interfaces,
       and sets the appropriate prefix length on each  according  to  received
       Routing	Advertisement  messages.  in.ndpd will not stop dhcpagent; use
       ifconfig(1M) to control dhcpagent if necessary.

       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	inter‐
       face ID segment of the IPv6 address. A link-local address is not gener‐
       ated with the temporary address as the interface ID.

       If the kernel detects a duplicate temporary address, in.ndpd will auto‐
       matically choose another.

       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

       Supported  options  and	equivalent  SMF	 service properties are listed
       below. SMF service properties are set using a command of the form:

	 # routeadm -m ndp:default key=value


	   Turn off stateless and stateful 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 fol‐
	   lowing lines in ndpd.conf(4):

	     ifdefault StatefulAddrConf off
	     ifdefault StatelessAddrConf off

	   Use of this option is equivalent to setting the stateless_addr_conf
	   property to false.


	   Turn on large amounts of debugging output on stdout. When set,  the
	   program  runs  in the foreground and stays attached to the control‐
	   ling terminal.  Use of this option is  equivalent  to  setting  the
	   debug property to true.

       -f  config_file

	   Use	config_file  for  configuration	 information  instead  of  the
	   default /etc/inet/ndpd.conf. Use of this option  is	equivalent  to
	   setting  the	 config_file  property to the configuration file to be


	   Turn on tracing (printing) of all sent and received packets	tostd‐
	   out.	  When	set,  the  program  runs  in  the foreground and stays
	   attached to the controlling terminal. As such, this	option	cannot
	   be run under the SMF.

			      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.

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

       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 Autoconfigura‐
       tion. 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.

       Receipt of a  SIGHUP  signal  will  make	 in.ndpd  restart  and	reread

       The  in.ndpd daemon service is managed by the service management facil‐
       ity, smf(5), under the service identifier:


       Administrative actions on this service, such as enabling, disabling, or
       requesting restart, can be performed using svcadm(1M) or routeadm(1M).

				 Jan 10, 2007			   IN.NDPD(1M)

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