is the router advertisement daemon for IPv6. It listens to router
solicitations and sends router advertisements as described in
"Neighbor Discovery for IP Version 6 (IPv6)" (RFC 4861).
With these advertisements hosts can automatically configure their
addresses and some other parameters. They also can choose a default
router based on these advertisements.
Note that if debugging is not enabled,
will not start if IPv6 forwarding is disabled. IPv6 forwarding can be
controlled via sysctl(8),
on Linux or
Similarly, the configuration file must not be writable by others, and if
non-root operation is requested, not even by self/own group.
For every one character option there is also a long option, which
is listed right next to the "short" option name:
Displays the version of
and then aborts.
Displays a short usage description and then aborts.
On Linux if
is specified, privilege separation is enabled and there will be
This option disables privilege separation, and as a result,
the non-privileged radvd process does not have permissions to
change interface configuration.
Test configuration and do startup tests and then exit.
-d debuglevel, --debug debuglevel
With this option you turn on debugging information. The debugging level is
an integer in the range from 1 to 5, from quiet to very verbose. A
debugging level of 0 completely turns off debugging. If a debugging level
greater than 0 is used,
doesn't background itself on start. The default debugging level is 0.
-C configfile, --config configfile
Specifies an alternate config file. Normally the compiled in default
-p pidfile, --pidfile pidfile
Specifies an alternate pidfile. Normally the compiled in default
-m method, --logmethod method
Specifies the logging method to use. Possibly values are:
Completely disables any logging.
Logs to the logfile which is specified by the
option. If no logfile is specified on the command line, then
a compiled in default is used (see next option).
Logs to standard error.
Logs only the high messages (of at least LOG_ERR priority) to standard
error, and everything to syslog (default method).
Logs to syslog.
-l logfile, --logfile logfile
Specifies the logfile to use when using the logging method
The default logfile is
-f facility, --facility facility
Specifies the facility (as an integer) when using syslog logging. Default
-t chrootdir, --chrootdir chrootdir
If specified, switches to
before doing anything else. This directory and its
subdirectories must have been populated first.
For security reasons,
must always be used when using
Note that on Linux
requires access to the
so it is more challenging to set up the chroot environment.
-u username, --username username
If specified, drops root privileges and changes user ID to
and group ID to the primary group of
This is recommended for security reasons.
You might also need to use
to point to a file in a
-writable directory (e.g. /var/run/radvd/radvd.pid).