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Router solicitation daemon.

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 [-dDfFm1] [-O script-name] interface ...
rtsold [-dDfFm1] [-O script-name] -a
rtsol [-dDF] [-O script-name] interface ...
rtsol [-dD] [-O script-name] -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.
Enable debugging.
Enable more debugging including the printing of internal timer information.
Prevent rtsolPrevent rtsold from becoming a daemon (foreground mode). Warning messages are generated to standard error instead of syslog(3). (Not supported by INtime).
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).
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.
Perform only one probe. Transmit Router Solicitation packets until at least one valid Router Advertisement packet has arrived on each interface, then exit.
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 single argument of the receiving interface name, expecting the script will then start a protocol for the other 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. (Not supported by INtime)


rrtsold should be used on IPv6 hosts (non-router nodes) only.

rtsold sends at most 3 Router Solicitations on an interface after one of the following events:

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.

rrtsold 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. 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.

Return values

The rtsold program exits 0 on success, and >0 on failures.



INtime 4.0


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.

See Also