Manual Pages  — RTADVD

rtadvd sends router advertisement packets to the specified interfaces. If no interfaces are specified, rtadvd will still run, but will not advertise any routes until interfaces are added using rtadvctl(8).

The program will daemonize itself on invocation. It will then send router advertisement packets periodically, as well as in response to router solicitation messages sent by end hosts.

Router advertisements can be configured on a per-interface basis, as described in rtadvd.conf(5).

If there is no configuration file entry for an interface, or if the configuration file does not exist altogether, rtadvd sets all the parameters to their default values. In particular, rtadvd reads all the interface routes from the routing table and advertises them as on-link prefixes.

rtadvd also watches the routing table. If an interface direct route is added on an advertising interface and no static prefixes are specified by the configuration file, rtadvd adds the corresponding prefix to its advertising list.

Similarly, when an interface direct route is deleted, rtadvd will start advertising the prefixes with zero valid and preferred lifetimes to help the receiving hosts switch to a new prefix when renumbering. Note, however, that the zero valid lifetime cannot invalidate the autoconfigured addresses at a receiving host immediately. According to the specification, the host will retain the address for a certain period, which will typically be two hours. The zero lifetimes rather intend to make the address deprecated, indicating that a new non-deprecated address should be used as the source address of a new connection. This behavior will last for two hours. Then rtadvd will completely remove the prefix from the advertising list, and succeeding advertisements will not contain the prefix information.

Moreover, if the status of an advertising interface changes, rtadvd will start or stop sending router advertisements according to the latest status.

The -s option may be used to disable this behavior; rtadvd will not watch the routing table and the whole functionality described above will be suppressed.

Basically, hosts MUST NOT send Router Advertisement messages at any time (RFC 4861, Section 6.2.3). However, it would sometimes be useful to allow hosts to advertise some parameters such as prefix information and link MTU. Thus, rtadvd can be invoked if router lifetime is explicitly set zero on every advertising interface.

The command line options are:

-c
	Specify an alternate location, configfile, for the configuration file. By default, /etc/rtadvd.conf is used.
-C
	Specify an alternate location for the control socket used by rtadvctl(8). The default is /var/run/rtadvd.sock.
-d
	Print debugging information.
-D
	Even more debugging information is printed.
-f
	Foreground mode (useful when debugging). Log messages will be dumped to stderr when this option is specified.
-M
	Specify an interface to join the all-routers site-local multicast group. By default, rtadvd tries to join the first advertising interface appearing on the command line. This option has meaning only with the -R option, which enables routing renumbering protocol support.
-p
	Specify an alternative file in which to store the process ID. The default is /var/run/rtadvd.pid.
-R
	Accept router renumbering requests. If you enable it, certain IPsec setup is suggested for security reasons. This option is currently disabled, and is ignored by rtadvd with a warning message.
-s
	Do not add or delete prefixes dynamically. Only statically configured prefixes, if any, will be advertised.

Use SIGHUP to reload the configuration file /etc/rtadvd.conf. If an invalid parameter is found in the configuration file upon the reload, the entry will be ignored and the old configuration will be used. When parameters in an existing entry are updated, rtadvd will send Router Advertisement messages with the old configuration but zero router lifetime to the interface first, and then start to send a new message.

Use SIGTERM to kill rtadvd gracefully. In this case, rtadvd will transmit router advertisement with router lifetime 0 to all the interfaces (in accordance with RFC 4861 6.2.5).

rtadvd.conf(5), rtadvctl(8), rtsol(8)

Thomas Narten, Erik Nordmark, W. A. Simpson, Hesham Soliman, RFC 4861, Neighbor Discovery for IP version 6 (IPv6),

Thomas Narten, Erik Nordmark, W. A. Simpson, RFC 2461 (obsoleted by RFC 4861), Neighbor Discovery for IP version 6 (IPv6),

Richard Draves, draft-ietf-ipngwg-router-selection-xx.txt, Default Router Preferences and More-Specific Routes,

J. Jeong, S. Park, L. Beloeil, S. Madanapalli, RFC 6106, IPv6 Router Advertisement Options for DNS Configuration,

There used to be some text that recommended users not to let rtadvd advertise Router Advertisement messages on an upstream link to avoid undesirable icmp6(4) redirect messages. However, based on the later discussion in the IETF ipng working group, all routers should rather advertise the messages regardless of the network topology, in order to ensure reachability.