in.ndpd(1M) System Administration Commands in.ndpd(1M)NAMEin.ndpd - daemon for IPv6 autoconfiguration
SYNOPSIS
/usr/lib/inet/in.ndpd [-adt] [-f config_file]
DESCRIPTIONin.ndpd provides both the host and router autoconfiguration components
of Neighbor Discovery for IPv6 and Stateless Address Autoconfiguration
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), includ‐
ing:
o address resolution;
o neighbor unreachability detection; and
o redirect.
The duplicate address detection function is implemented by ifcon‐
fig(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 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.
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.
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
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 std‐
out. 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 neces‐
sary on a host, but it is required on a
router to enable in.ndpd to advertise auto‐
configuration information to the hosts.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE │
│VALUE │ │
├─────────────────────────────┼─────────────────────────────┤
│Availability │SUNWcsu │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOifconfig(1M), ndpd.conf(4), attributes(5), icmp6(7P),ip6(7P),
attributes(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.
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)
