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OpenDarwin 7.2.1 - man page for rtsold (opendarwin section 8)

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

NAME
     rtsold -- router solicitation daemon

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

DESCRIPTION
     rtsold is the daemon program to send ICMPv6 Router Solicitation 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.

     rtsold 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:

     o	 Just after invocation of rtsold daemon.
     o	 The interface is up after a temporary interface failure.  rtsold 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.
     o	 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 specifi-
	 cation, but is provided for mobile stations.  The default interval for router advertise-
	 ments, 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 pos-
	 sible 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.  rtsold 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      -f prevents 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 periodi-
	     cally 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.

DIAGNOSTICS
     The rtsold utility exits 0 on success, and >0 if an error occurs.

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

SEE ALSO
     rtadvd(8), sysctl(8)

HISTORY
     The rtsold command is based on the rtsol command, which first appeared in WIDE/KAME IPv6
     protocol stack kit.  rtsol is now integrated into rtsold(8).

BUGS
     In some operating systems, when a PCMCIA network card is removed and reinserted, the corre-
     sponding 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
     reinsert 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 ker-
     nel error messages if you try to autoconfigure a host with multiple interfaces.  Also, it
     seems contradictory for rtsold to accept multiple interface arguments.

BSD					   May 17, 1998 				      BSD


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