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RTADVD(8)                 BSD System Manager's Manual                RTADVD(8)

NAME
     rtadvd -- router advertisement daemon

SYNOPSIS
     rtadvd [-dDfMRs] [-c configfile] [-F dumpfile] [-p pidfile] interface ...

DESCRIPTION
     rtadvd sends router advertisement packets to the specified interfaces.

     The program will daemonize itself on invocation.  It will then send router advertisement packets peri-odically, periodically,
     odically, 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 prefixes.

     rtadvd also watches the routing table.  If an interface direct route is added on an advertising inter-face interface
     face and no static prefixes are specified by the configuration file, rtadvd adds the corresponding pre-fix prefix
     fix to its advertising list.

     Similarly, when an interface direct route is deleted, rtadvd will start advertising the prefixes with
     zero valid and preferred lifetimes to help the receiving hosts switch to a new prefix when renumbering.
     Note, however, that the zero valid lifetime cannot invalidate the autoconfigured addresses at a receiv-ing receiving
     ing host immediately.  According to the specification, the host will retain the address for a certain
     period, which will typically be two hours.  The zero lifetimes rather intend to make the address depre-cated, deprecated,
     cated, indicating that a new non-deprecated address should be used as the source address of a new con-nection. connection.
     nection.  This behavior will last for two hours.  Then rtadvd will completely remove the prefix from
     the advertising list, and succeeding advertisements will not contain the prefix information.

     Moreover, if the status of an advertising interface changes, rtadvd will start or stop sending router
     advertisements according to the latest status.

     The -s option may be used to disable this behavior; rtadvd will not watch the routing table and the
     whole functionality described above will be suppressed.

     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 infor-mation information
     mation and link MTU.  Thus, rtadvd can be invoked if router lifetime is explicitly set zero on every
     advertising interface.

     The command line options are:

     -c      Specify an alternate location, configfile, for the configuration 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.

     -F      Specify an alternative file in which to dump internal states when rtadvd receives signal
             SIGUSR1.  The default is /var/run/rtadvd.dump.

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

     -p      Specify an alternative file in which to store the process ID.  The default is
             /var/run/rtadvd.pid.

     -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 internal state into /var/run/rtadvd.dump
     or the file specified with option -F.

     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 RFC2461 6.2.5).

FILES
     /etc/rtadvd.conf                  The default configuration file.
     /var/run/rtadvd.pid               The default process ID file.
     /var/run/rtadvd.dump              The default file in which rtadvd dumps its internal state.

EXIT STATUS
     The rtadvd utility exits 0 on success, and >0 if an error occurs.

SEE ALSO
     rtadvd.conf(5), rtsol(8)

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

BUGS
     There used to be some text that recommended users not to let rtadvd advertise Router Advertisement mes-sages messages
     sages 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 ensure reachability.

BSD                             August 27, 2011                            BSD