RTSOLD(8) FreeBSD System Manager's Manual RTSOLD(8)
NAME
rtsold, rtsol - router solicitation daemon
SYNOPSIS
rtsold [-dDfFimu1] [-M script-name] [-O script-name] [-p pidfile]
[-R script-name] interface ...
rtsold [-dDfFimu1] [-M script-name] [-O script-name] [-p pidfile]
[-R script-name] -a
rtsol [-dDiu] [-M script-name] [-O script-name] [-R script-name]
interface ...
rtsol [-dDiu] [-M script-name] [-O script-name] [-R script-name] -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:
• Just after invocation of rtsold daemon.
• 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.
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.
rtsold manages a per-interface parameter to detect if a separate protocol
is needed for configuration parameters other than host's addresses. At
the invocation time, the flag is FALSE, and becomes TRUE when the daemon
receives a router advertisement with the OtherConfig flag being set. A
script file can be specified to deal with the case (see below). When
rtsold start resending router solicitation messages by one of the
conditions events, the daemon resets the parameter because the event may
indicate a change on the attached link.
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 interfaces. rtsold will try to find any non-
loopback, IPv6-capable interfaces and send router solicitation
messages on all of them.
-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).
-F Explicitly configure the kernel to accept Router Advertisements
and disable IPv6 forwarding. These settings are required for
proper rtsold operation. Without this option, the current
settings will be obeyed; if they are incompatible with proper
operation, warning messages will be generated, but Router
Solicitations will still be sent. The settings may be changed
manually with sysctl(8) and ifconfig(8).
-i Transmit Router Solicitation packets immediately, without waiting
the normal random (between 0 and 1 second) delay. This option
should not be used on networks where it might result in
congestion due to many hosts simultaneously (re)connecting and
sending such packets.
-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.
-M script-name
Specifies a supplement script file to handle the Managed
Configuration flag of the router advertisement. When the flag
changes from FALSE to TRUE, rtsold will invoke script-name with a
first argument of the receiving interface name and a second
argument of the sending router address, expecting the script will
then start a protocol for the managed configuration. script-name
must be the absolute path from root to the script file, be a
regular file, and be created by the same owner who runs rtsold.
-O script-name
Specifies a supplement script file to handle the Other
Configuration flag of the router advertisement. When the flag
changes from FALSE to TRUE, rtsold will invoke script-name with a
first argument of the receiving interface name and a second
argument of the sending router address, expecting the script will
then start a protocol for the other configuration. The script
will not be run if the Managed Configuration flag in the router
advertisement is also TRUE. script-name must be the absolute
path from root to the script file, be a regular file, and be
created by the same owner who runs rtsold.
-p pidfile
Writes the process ID of rtsold to pidfile instead of the default
PID file /var/run/rtsold.pid.
-R script-name
Specifies a script to run when router advertisement options RDNSS
(Recursive DNS Server) or DNSSL (DNS Search List) are
encountered. The information of DNS servers and DNS search
domains will be sent to standard input of this script. The
resolvconf(8) script is used by default.
-u Specifies whether to add the source address of Router
Advertisement messages to the interface name in the parameters of
the RDNSS and DNSSL scripts.
If -u is specified, the interface name in the script parameters
will be `ifname:slaac:[RA-source-address]'.
Otherwise it will be `ifname:slaac'.
FILES
/var/run/rtsold.pid The PID of the currently running rtsold.
/var/run/rtsold.dump Internal state dump file.
EXIT STATUS
The rtsold utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
resolvconf(8), 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,
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 kernel error messages if you try to autoconfigure a host with
multiple interfaces. Also, it seems contradictory for rtsold to accept
multiple interface arguments.
FreeBSD 13.1-RELEASE-p6 November 12, 2021 FreeBSD 13.1-RELEASE-p6
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