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NAME    [Toc]    [Back]

     rtadvd - router advertisement daemon

SYNOPSIS    [Toc]    [Back]

     rtadvd [-dDfMRs] [-c configfile] interface ...

DESCRIPTION    [Toc]    [Back]

     rtadvd sends router advertisement packets to  the  specified

     The  program  will  daemonize itself on invocation.  It will
then send
     router advertisement packets periodically, as well as in response to
     router solicitation messages sent by end hosts.

     Router  advertisements  can be configured on a per-interface
basis, as described
 in rtadvd.conf(5).

     If there is no configuration file entry for an interface, or
if the configuration
  file  does not exist altogether, rtadvd sets all
the parameters
     to their default values.  In particular,  rtadvd  reads  all
the interface
     routes from the routing table and advertises them as on-link

     rtadvd also watches the routing table.  By  default,  if  an
interface direct
  route is added/deleted on an advertising interface and
no static
     prefixes are specified by  the  configuration  file,  rtadvd
adds/deletes the
     corresponding  prefix  to/from its advertising list, respectively.  The -s
     option may be used to disable this behavior.   Moreover,  if
the status of
     an  advertising interface changes, rtadvd will start or stop
     router advertisements according to the latest status.

     Basically, hosts MUST NOT send Router Advertisement messages
at any time
     (RFC  2461,  Section 6.2.3).  However, it would sometimes be
useful to allow
 hosts to advertise some parameters such as prefix information and
     link MTU.  Thus, rtadvd can be invoked if router lifetime is
     set zero on every advertising interface.

     The command line options are:

     -c      Specify an alternate location, configfile,  for  the
             file.  By default, /etc/rtadvd.conf is used.

     -d      Print debugging information.

     -D      Even more debugging information is printed.

     -f       Foreground  mode (useful when debugging).  Log messages will be
             dumped to stderr when this option is specified.

     -M      Specify an interface to join the  all-routers  sitelocal multicast
             group.   By  default, rtadvd tries to join the first
             interface appearing on the command line.   This  option has meaning
             only  with  the  -R  option,  which  enables routing
renumbering protocol

     -R      Accept router renumbering requests.  If  you  enable
it, certain
             IPsec setup is suggested for security reasons.  This
option is
             currently disabled, and is ignored by rtadvd with  a
warning message.

     -s       Do  not  add  or delete prefixes dynamically.  Only
statically configured
 prefixes, if any, will be advertised.

     Upon receipt of signal SIGUSR1, rtadvd will dump the current
     state into /var/run/rtadvd.dump.

     Use SIGTERM to kill rtadvd gracefully.  In this case, rtadvd
will transmit
 router advertisement with router lifetime 0 to  all  the
interfaces (in
     accordance with RFC 2461 6.2.5).

RETURN VALUES    [Toc]    [Back]

     The rtadvd program exits 0 on success, and >0 on failures.

FILES    [Toc]    [Back]

     /etc/rtadvd.conf                   The default configuration
     /var/run/rtadvd.pid               contains the  pid  of  the
currently running
     /var/run/rtadvd.dump               The  file in which rtadvd
dumps its internal

SEE ALSO    [Toc]    [Back]

     rtadvd.conf(5), rtsol(8)

HISTORY    [Toc]    [Back]

     The rtadvd command first appeared in the WIDE Hydrangea IPv6
     stack kit.

BUGS    [Toc]    [Back]

     There used to be some text that recommended users not to let
rtadvd advertise
 Router Advertisement messages on an upstream link to
avoid undesirable
  icmp6(4)  redirect messages.  However, based on the
later discussion
 in the IETF IPng  working  group,  all  routers  should
rather advertise
     the messages regardless of the network topology, in order to

OpenBSD      3.6                           May      17,      1998
[ Back ]
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