rtradvd(1M) rtradvd(1M)
NAME [Toc] [Back]
rtradvd - Router Advertisement daemon for IPv6
SYNOPSIS [Toc] [Back]
rtradvd [-C] [-c configfile] [-d debuglevel] [-i] [-p pidfile]
[debugfile]
DESCRIPTION [Toc] [Back]
rtradvd, the router advertisement daemon for IPv6, implements router
functionality as specified by RFC 2461 ("Neighbor Discovery for IP
Version 6"). The daemon listens to router solicitation and sends
router advertisement messages on demand and periodically as described
in "Neighbor Discovery for IP Version 6". These advertisements allow
any listening host to configure their addresses and some other
parameters automatically without manual intervention. They can also
choose a default router based on these advertisements.
Router advertisement is configured on a per interface basis, as
described in rtradvd.conf(4). The "PRIVATE" flag (IFF_PRIVATE) on
each interface must be cleared in order to enable sending Router
Advertisement packets out on that particular interface as described by
ifconfig(1M). The daemon does not listen on an interface when the
"PRIVATE" flag is set.
rtradvd also implements four new Mobile IPv6 ICMPv6 message types, two
for use in the dynamic home agent address discovery mechanism, and two
for mobile configuration mechanisms. These four new ICMPv6 messages
are activated if "Home Agent Flag" (see rtradvd.conf(4)) is enabled on
any configured interface and the daemon detects the Mobile IPv6 kernel
module during startup (see mip6mod(7)) or via mip6admin(1M) utility.
In this case, rtradvd sends mip6mod the list of prefixes configured
with the "Router Address Flag" set to on, allowing the node to act as
a home agent on all the links corresponding to these prefixes (see
rtradvd.conf(4)).
Options [Toc] [Back]
-C Specifies that the configuration file will be
parsed for syntax errors and coherency. Any
syntax error or incoherency data is printed to
stderr. rtradvd will exit with a status 1 if
there were any errors or 0 (zero) if there were
not. All other command line options except -c are
ignored.
-c configfile Use a configuration file other than
/etc/rtradvd.conf.
-d debuglevel Print debugging information. If debugfile is not
specified, the daemon stays in foreground mode. A
number after the d determines the level of
messages printed. The level must be an integer in
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the range from 1 to 10, with higher numbers
resulting in greater detail in debug messages.
-i Disable printing the inconsistency information via
syslog(3C) in router advertisement messages
received from other routers on the link.
-p pidfile Use a pid file other than /var/run/rtradvd.pid.
debugfile Specifies a debug file in which to place debug
information. If a debug file is specified on the
command line, rtradvd detaches from the terminal
and runs in the background. Otherwise, rtradvd
assumes that debugging is desired to stderr and
remains in the foreground.
The rtradvd daemon includes Mobile IPv6 options in Router
Advertisement messages when the configuration file contains the
specific Mobile IPv6 keywords (see rtradvd.conf(4)).
The rtradvd daemon can be started during boot-time initialization. To
do so, see /etc/rc.config.d/netconf-ipv6 for rtradvd entries.
The following signals have the specified effect when sent to the
server process using the kill(1) command:
SIGHUP causes rtradvd to read the configuration file and
reload the database. If the configuration file
contains an error or inconsistency, the daemon
continues with the old configuration database. The
syslog file should be checked for errors.
SIGTERM terminates rtradvd gracefully. In this case, before
exiting, rtradvd will transmit router advertisement
with Router Lifetime 0 to all the listening
interfaces. This can take up to 10 seconds.
DIAGNOSTICS [Toc] [Back]
Any errors encountered by rtradvd in the configuration file, or in
normal operation are logged via syslog(3C).
NOTE [Toc] [Back]
The following ICMPv6 types are assigned for Mobile IPv6:
Home Agent Address Discovery Request: ICMPv6 type 144
Home Agent Address Discovery Reply: ICMPv6 type 145
Mobile Prefix Solicitation: ICMPv6 type 146
Mobile Prefix Advertisement: ICMPv6 type 147
Refer to the Mobile IPv6 Administrator's Guide for information on
configuring Virtual IPv6 Anycast addresses.
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AUTHOR [Toc] [Back]
rtradvd was developed by HP.
FILES [Toc] [Back]
/etc/rtradvd.conf The default configuration file
/var/run/rtradvd.pid Process ID of running rtradvd
/etc/rc.config.d/netconf-ipv6 To enable rtradvd at system
initialization.
SEE ALSO [Toc] [Back]
kill(1), ifconfig(1M), mip6admin(1M), syslog(3C), rtradvd.conf(4),
mip6mod(7), ndp(7P).
1. T. Narten, E. Nordmark, W. Simpson, Neighbor Discovery for IP
Version 6 (IPv6), RFC2461, December 1998.
2. S. Thompson, T. Narten, IPv6 Stateless Address Autoconfiguration,
RFC2462, December 1998.
3. D. Johnson, C. Perkins, Mobility Support in IPv6, IETF document.
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