rtsol(8)
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RTSOLD(8) NetBSD 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 host (non-router node) 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. 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.
+ Every 60 seconds if the -m option is specified and the rtsold daemon
cannot get the interface status. This feature does not conform to
IPv6 neighbor discovery specification, but is provided for mobile
stations. 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 sends a Router Solicitation, and receives a valid Router Ad-
vertisement, 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 its link-layer ad-
dress.
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-p2p and IPv6-capable, interface. If rtsold finds
multiple interfaces, rtsold will exit with error.
-d Enable debugging.
-D Enable more debugging including to print internal timer informa-
tion.
-f -f prevents rtsold from becoming a daemon (foreground mode).
Warning messages are generated to standard error output, 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 packet un-
til valid Router Advertisement packet arrives all the interfaces
more than once, then exit.
RETURN VALUES
The program exits with 0 on success, non-zero on failures.
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 corresponding interface index is changed. However, rt-
sold does not assume such changes, 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.
IPv6 autoconfiguration specification assumes single interface host. You
may see kernel error message if you try to autoconfigure a host with mul-
tiple interfaces. Also, it seems contradictory for rtsold to accept mul-
tiple interfaces in argument.
NetBSD 1.5.3 May 17, 1998 2
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