RTSOLD(8) OpenBSD System Manager's Manual RTSOLD(8)
rtsold - router solicitation daemon
rtsold [-dDfFm1] interface ...
rtsold [-dDfFm1] -a
rtsol [-dDF] interface ...
rtsol [-dD] -a
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 de-
tects 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 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 ad-
Upon receipt of signal SIGUSR1, rtsold will dump the current internal
state into /var/run/rtsold.dump.
The options are as follows:
-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
-f -f prevents rtsold from becoming a daemon (foreground mode).
Warning messages are generated to standard error instead of
-F Configure sysctl(8) variable related to rtsold by itself. With-
out -F, rtsold will not alter and obey the current sysctl(8) set-
-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
-1 Perform only one probe. Transmit Router Solicitation packets un-
til at least one valid Router Advertisement packet has arrived on
each interface, then exit.
The rtsold program exits 0 on success, and >0 on failures.
/var/run/rtsold.dump dumps internal state on.
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.
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
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.
OpenBSD 3.6 May 17, 1998 2