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RTSOLD(8)              DragonFly System Manager's Manual             RTSOLD(8)


NAME

     rtsold, rtsol -- router solicitation daemon


SYNOPSIS

     rtsold [-dDfm1] interface ...
     rtsold [-dDfm1] -a
     rtsol [-dD] interface ...
     rtsol [-dD] -a


DESCRIPTION

     The rtsold utility is the daemon program to send ICMPv6 Router Solicita-
     tion messages on the specified interfaces.  If a node (re)attaches to a
     link, rtsold sends some Router Solicitations on the link destined to the
     link-local scope all-routers multicast address to discover new routers
     and to get non link-local addresses.

     The rtsold utility should be used on IPv6 hosts (non-router nodes) only.

     If you invoke the program as rtsol, it will transmit probes from the
     specified interface, without becoming a daemon.  In other words, rtsol
     behaves as ``rtsold -f1 interfaces''.

     Specifically, rtsold sends at most 3 Router Solicitations on an interface
     after one of the following events:

     *   Just after invocation of rtsold daemon.
     *   The interface is up after a temporary interface failure.  The rtsold
         utility detects such failures by periodically probing to see if the
         status of the interface is active or not.  Note that some network
         cards and drivers do not allow the extraction of link state.  In such
         cases, rtsold cannot detect the change of the interface status.
     *   Every 60 seconds if the -m option is specified and the rtsold daemon
         cannot get the interface status.  This feature does not conform to
         the IPv6 neighbor discovery specification, but is provided for mobile
         stations.  The default interval for router advertisements, which is
         on the order of 10 minutes, is slightly long for mobile stations.
         This feature is provided for such stations so that they can find new
         routers as soon as possible when they attach to another link.

     Once rtsold has sent a Router Solicitation, and has received a valid
     Router Advertisement, it refrains from sending additional solicitations
     on that interface, until the next time one of the above events occurs.

     When sending a Router Solicitation on an interface, rtsold includes a
     Source Link-layer address option if the interface has a link-layer
     address.

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


OPTIONS

     -a      Autoprobe outgoing interface.  The rtsold utility will try to
             find a non-loopback, non-point-to-point, IPv6-capable interface.
             If rtsold finds multiple interfaces, rtsold will exit with error.

     -d      Enable debugging.

     -D      Enable more debugging including the printing of internal timer
             information.

     -f      Prevent rtsold from becoming a daemon (foreground mode).  Warning
             messages are generated to standard error instead of syslog(3).

     -m      Enable mobility support.  If this option is specified, rtsold
             sends probing packets to default routers that have advertised
             Router Advertisements when the node (re)attaches to an interface.
             Moreover, if the option is specified, rtsold periodically sends
             Router Solicitation on an interface that does not support
             SIOCGIFMEDIA ioctl.

     -1      Perform only one probe.  Transmit Router Solicitation packets
             until at least one valid Router Advertisement packet has arrived
             on each interface, then exit.


FILES

     /var/run/rtsold.pid   the pid of the currently running rtsold.
     /var/run/rtsold.dump  dumps internal state on.


EXIT STATUS

     The rtsold and rtsol utilities exit 0 on success, and >0 if an error
     occurs.


SEE ALSO

     rtadvd(8), sysctl(8)


HISTORY

     The rtsold utility is based on the rtsol utility, which first appeared in
     WIDE/KAME IPv6 protocol stack kit.  The rtsol utility is now integrated
     into rtsold.


BUGS

     In some operating systems, when a PCMCIA network card is removed and
     reinserted, the corresponding interface index is changed.  However,
     rtsold assumes such changes will not occur, and always uses the index
     that it got at invocation. As a result, rtsold may not work if you rein-
     sert a network card.  In such a case, rtsold should be killed and
     restarted.

     The IPv6 autoconfiguration specification assumes a single-interface host.
     You may see kernel error messages if you try to autoconfigure a host with
     multiple interfaces.  Also, it seems contradictory for rtsold to accept
     multiple interface arguments.

DragonFly 3.5                    May 17, 1998                    DragonFly 3.5

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