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radvd - Router Advertisement Daemon…  more info»


RADVD(8)                                                    RADVD(8)

       radvd - router advertisement daemon for IPv6

       radvd  [ -hsv ] [ -d debuglevel ] [ -C configfile ] [ -p pid‐
       file ] [ -m logmethod ] [ -l logfile ] [ -f facility ]  [  -t
       chrootdir ] [ -u username ]

       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  automati‐
       cally  configure  their  addresses and some other parameters.
       They also can choose a default router based on  these  adver‐

       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.

       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 separa‐
              tion 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 permis‐
              sions to change interface configuration.

       -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  com‐
              piled in default /etc/radvd.conf is used.

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

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

              none   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).

              stderr Logs to standard error.

                     Logs  only  the  high  messages  (of  at  least
                     LOG_ERR priority) to standard error, and every‐
                     thing 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

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

       -t chrootdir, --chrootdir chrootdir
              If  specified, switches to chrootdir before doing any‐
              thing 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.


       There certainly are some bugs. If you find them or have other
       suggestions please contact Pekka Savola <>.

       radvd.conf(5), radvdump(8)

       Pedro Roque    <> - wrote first version for Linux
       Lars Fenneberg <>  - previous maintainer
       Nathan Lutchansky   <>    - previous maintainer
       Pekka Savola   <> - current maintainer
       Craig Metz     <>   - port to NRL's IPv6 code for BSD4.4
       Marko Myllynen <>   - RFC 2461 update, Mobile IPv6 support
       Jim Paris <>      - Privilege separation support

radvd 1.6                    24 Jan 2008                    RADVD(8)
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