is the daemon program to send ICMPv6 Router
Solicitation messages on the specified interfaces. If a node (re)attaches to a
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.
should be used on IPv6 hosts (non-router
nodes) only. The net.inet6.ip6.forwarding
set to zero and the
set to a non-zero value (see also the -F
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 interface ...”.
An interface may be configured at boot to be brought up using
file. See that man page for more information.
sends at most 3 Router Solicitations on an
interface after one of the following events:
- Just after invocation of
- 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.
- 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.
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
When sending a Router Solicitation on an interface,
includes a Source Link-layer address
option if the interface has a link-layer address.
is able to do some additional configuration
for interfaces where more than setting the host's address is needed. When the
daemon receives a router advertisement with the “Other
Configuration” flag set, the script specified using the
option is run.
Upon receipt of signal
will dump the current internal state into
The options are as follows:
- Perform only one probe. Transmit Router Solicitation
packets until at least one valid Router Advertisement packet has arrived
on each interface, then exit.
- Autoprobe outgoing interfaces.
rtsold will try to find any non-loopback,
non-point-to-point, IPv6-capable interfaces, and send router solicitation
messages on all of them.
- Enable more debugging (than that offered by the
-d option) including the printing of internal
- Enable debugging.
- Automatically set the
variables relating to rtsold (see above).
Without this option, rtsold will obey the
- This option prevents rtsold
from becoming a daemon (foreground mode). Warning messages are generated
to standard error instead of
- 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
- Specifies a script to handle the Other Configuration flag
of the router advertisement (see above).
script-name is invoked with a single
argument of the receiving interface name, expecting the script will then
start a protocol to provide additional configuration.
script-name should be specified as the
absolute path from root to the script file, and the file itself should be
a regular file and owned by the same user running
- Internal state dump file.
utility exits 0 on success,
and >0 if an error occurs.
command is based on the
command, which first appeared in WIDE/KAME
IPv6 protocol stack kit. rtsol
is now integrated
In some operating systems, when a PCMCIA network card is removed and reinserted,
the corresponding interface index is changed. However,
assumes such changes will not occur, and
always uses the index that it got at invocation. As a result,
may not work if you reinsert 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
to accept multiple