RTSOLD(8) BSD System Manager's Manual RTSOLD(8)NAME
rtsold, rtsol — router solicitation daemon
SYNOPSISrtsold [-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 ALSOrtadvd(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.
BSD May 17, 1998 BSD
