NAME
rtsold
, rtsol
— router solicitation
daemon
SYNOPSIS
rtsold |
[-dDfFmu1 ] [-M
script-name] [-O
script-name] [-p
pidfile] [-R
script-name] interface
... |
rtsold |
[-dDfFmu1 ] [-M
script-name] [-O
script-name] [-p
pidfile] [-R
script-name] -a |
rtsol |
[-dDu ] [-M
script-name] [-O
script-name] [-R
script-name] interface
... |
rtsol |
[-dDu ] [-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 thertsold
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, non-point-to-point, 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). -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 supportSIOCGIFMEDIA
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 single argument of the receiving interface name, 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 runsrtsold
. -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 single argument of the receiving interface name, 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 runsrtsold
. -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) orDNSSL
(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
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.