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NAME

rtadvd

 - router advertisement daemon

 

SYNOPSIS

] [-c configfile ] interface ...

DESCRIPTION

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.conf5.

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

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, adds the corresponding prefix to its advertising list.

Similarly, when an interface direct route is deleted, 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 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, will start or stop sending router advertisements according to the latest status.

The -s option may be used to disable this behavior; 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 2461, 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, 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.

-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, 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.

-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 with a warning message.

-s

Do not add or delete prefixes dynamically. Only statically configured prefixes, if any, will be advertised.

Upon receipt of signal SIGUSR1 will dump the current internal state into /var/run/rtadvd.dump

Use SIGTERM to kill gracefully. In this case, will transmit router advertisement with router lifetime 0 to all the interfaces (in accordance with RFC2461 6.2.5)  

RETURN VALUES

FILES

/etc/rtadvd.conf

The default configuration file.

/var/run/rtadvd.pid

contains the pid of the currently running .

/var/run/rtadvd.dump

The file in which dumps its internal state.

SEE ALSO

HISTORY

BUGS

Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUES

FILES

SEE ALSO

HISTORY

BUGS

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