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RADVD(8) RADVD(8)

NAME
radvd - router advertisement daemon for IPv6

SYNOPSIS
radvd [ -hsvc ] [ -d debuglevel ] [ -C configfile ] [ -p pidfile ] [ -m logmethod ] [ -l logfile ] [ -f facility ] [ -t
chrootdir ] [ -u username ]

DESCRIPTION
radvd 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, radvd will not start if IPv6 forwarding is disabled. IPv6 forwarding can be con-
trolled via sysctl(8), net.ipv6.conf.all.forwarding on Linux or net.inet6.ip6.forwarding on BSD.

Similarly, the configuration file must not be writable by others, and if non-root operation is requested, not even by
self/own group.

OPTIONS
For every one character option there is also a long option, which is listed right next to the "short" option name:

-v, --version
Displays the version of radvd and then aborts.

-h, --help
Displays a short usage description and then aborts.

-s, --singleprocess
On Linux if username is specified, privilege separation is enabled and there will be two processes. This option
disables privilege separation, and as a result, the non-privileged radvd process does not have permissions to
change interface configuration.

-c, --configtest
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, radvd 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 /etc/radvd.conf is used.

-p pidfile, --pidfile pidfile
Specifies an alternate pidfile. Normally the compiled in default /var/run/radvd/radvd.pid is used.

-m method, --logmethod method
Specifies the logging method to use. Possibly values are:

none Completely disables any logging.

logfile
Logs to the logfile which is specified by the -l option. If no logfile is specified on the command line,
then a compiled in default is used (see next option).

stderr Logs to standard error.

stderr_syslog
Logs only the high messages (of at least LOG_ERR priority) to standard error, and everything to syslog
(default method).

syslog Logs to syslog.

-l logfile, --logfile logfile
Specifies the logfile to use when using the logging method logfile. The default logfile is /var/log/radvd.log.

-f facility, --facility facility
Specifies the facility (as an integer) when using syslog logging. Default is LOG_DAEMON.

-t chrootdir, --chrootdir chrootdir
If specified, switches to chrootdir before doing anything else. This directory and its subdirectories must have
been populated first. For security reasons, -u must always be used when using chrootdir.

Note that on Linux radvd requires access to the /proc filesystem, 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 username and group ID to the primary group of username.
This is recommended for security reasons. You might also need to use -p to point to a file in a username
-writable directory (e.g. /var/run/radvd/radvd.pid).

FILES
/usr/sbin/radvd
/etc/radvd.conf
/var/run/radvd/radvd.pid
/var/log/radvd.log

BUGS
There certainly are some bugs. If you find them or have other suggestions please contact Pekka Savola <pekkas@net-
core.fi>.