radvd - router advertisement daemon for IPv6

       Pedro Roque    <roque@di.fc.ul.pt> - wrote first version for Linux
       Lars Fenneberg <lf@elemental.net>  - previous maintainer
       Nathan Lutchansky   <lutchann@litech.org>    - previous maintainer
       Pekka Savola   <pekkas@netcore.fi>     - previous maintainer
       Craig Metz     <cmetz@inner.net>   - port to NRL's IPv6 code for BSD4.4
       Marko Myllynen <myllynen@lut.fi>   - RFC 2461 update, Mobile IPv6 support
       Jim Paris <jim@jtan.com>      - Privilege separation support
       Reuben Hawkins  <reubenhwk@gmail.com>   - previous maintainer
       Pierre Ossman   <pierre@ossman.eu>      - RFC6106 (DNSSL) support
       Varka Bhadram  <varkabhadram@gmail.com> - 6LoWPAN-ND (RFC6775) support
       Robin H. Johnson    <robbat2@gentoo.org>     - current maintainer, RA splitting per RFC 6980 & RFC4861#6.2.3
       Radek Zajic    <radek@zajic.v.pytli.cz> - NAT64 pref64 support (RFC8781)
       Geert Stappers <stappers@stappers.it>   - contributor

radvd 2.20                                         30 Dec 2024                                          RADVD(8)

       There certainly are some bugs. If you find them or have other suggestions please contact  Reuben  Hawkins
       <reubenhwk@gmail.com>.

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.  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.

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

       radvd - router advertisement daemon for IPv6

       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.

       -n, --nodaemon
              Prevent the daemonizing.

       -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 /run/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).

radvd.conf(5), radvdump(8)

radvd[-hsvc][-ddebuglevel][-Cconfigfile][-ppidfile][-mlogmethod][-llogfile][-nnodaemon][-ffacility][-tchrootdir][-uusername]