radvd - router advertisement daemon for IPv6
radvd [ -hsvc ] [ -d debuglevel ] [ -C
configfile ] [ -p pidfile ] [ -m
logmethod ] [ -l logfile ] [ -f
facility ] [ -t chrootdir ] [ -u
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.
It also defines "Neighbor Discovery Optimization for IPv6 over Low-Power
Wireless Personal Area Networks (6LoWPANs)" (RFC6775). They also can
choose a default router based on these advertisements.
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:
- -v, --version
- Displays the version of radvd and then aborts.
- -h, --help
- Displays a short usage description and then aborts.
- -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.pid is used.
- -m method, --logmethod method
- Specifies the logging method to use. Possibly values
- Completely disables any logging.
- 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).
- 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
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
Note that on Linux radvd requires access to the /proc
filesystem, so it is more challenging to set up the chroot
- -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.
There certainly are some bugs. If you find them or have other suggestions please
contact Reuben Hawkins <email@example.com>.
Pedro Roque <firstname.lastname@example.org> - wrote first version for Linux
Lars Fenneberg <email@example.com> - previous maintainer
Nathan Lutchansky <firstname.lastname@example.org> - previous maintainer
Pekka Savola <email@example.com> - previous maintainer
Craig Metz <firstname.lastname@example.org> - port to NRL's IPv6 code for BSD4.4
Marko Myllynen <email@example.com> - RFC 2461 update, Mobile IPv6 support
Jim Paris <firstname.lastname@example.org> - Privilege separation support
Reuben Hawkins <email@example.com> - current maintainer
Pierre Ossman <firstname.lastname@example.org> - RFC6106 (DNSSL) support
Varka Bhadram <email@example.com> - 6LoWPAN-ND (RFC6775) support
Robin H. Johnson <firstname.lastname@example.org> - RA splitting per RFC 6980 & RFC4861#6.2.3