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       radvd - router advertisement daemon for IPv6


       radvd  [ -hsv ] [ -d debuglevel ] [ -C configfile ] [ -p pidfile ] [ -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 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  controlled  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 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

       -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/ is used.

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

              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 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

              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 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