radvd8

Usage

Overview

radvd is the router advertisement daemon for IPv6. It listens to router solicitations and sends router advertisements as described in "Neighbor Discovery for IP Version 6 (IPv6)" (RFC 4861). With these advertisements hosts can automatically configure their addresses and some other parameters. It also defines "Neighbor Discovery Optimization for IPv6 over Low-Power Wireless Personal Area Networks (6LoWPANs)" (RFC6775). They also can choose a default router based on these advertisements.

The configuration file must not be writable by others, and if non-root operation is requested, not even by self/own group.

Options

For every one character option there is also a long option, which is listed right next to the "short" option name:

-v, --version

Displays the version of radvd and then aborts.

-h, --help

Displays a short usage description and then aborts.

-c, --configtest

Test configuration and do startup tests and then exit.

-n, --nodaemon

Prevent the daemonizing.

-d debuglevel, --debug debuglevel

With this option you turn on debugging information. The debugging level is an integer in the range from 1 to 5, from quiet to very verbose. A debugging level of 0 completely turns off debugging. If a debugging level greater than 0 is used, radvd doesn't background itself on start. The default debugging level is 0.

-C configfile, --config configfile

Specifies an alternate config file. Normally the compiled in default /etc/radvd.conf is used.

-p pidfile, --pidfile pidfile

Specifies an alternate pidfile. Normally the compiled in default /run/radvd.pid is used.

-m method, --logmethod method

Specifies the logging method to use. Possibly values are:

none

Completely disables any logging.

logfile

Logs to the logfile which is specified by the -l option. If no logfile is specified on the command line, then a compiled in default is used (see next option).

stderr

Logs to standard error.

stderr_syslog

Logs only the high messages (of at least LOG_ERR priority) to standard error, and everything to syslog (default method).

syslog

Logs to syslog.

-l logfile, --logfile logfile

Specifies the logfile to use when using the logging method logfile. The default logfile is /var/log/radvd.log.

-f facility, --facility facility

Specifies the facility (as an integer) when using syslog logging. Default is LOG_DAEMON.

-t chrootdir, --chrootdir chrootdir

If specified, switches to chrootdir before doing anything else. This directory and its subdirectories must have been populated first. For security reasons, -u must always be used when using chrootdir.

Note that on Linux radvd requires access to the /proc filesystem, so it is more challenging to set up the chroot environment.

-u username, --username username

If specified, drops root privileges and changes user ID to username and group ID to the primary group of username. This is recommended for security reasons. You might also need to use -p to point to a file in a username -writable directory (e.g. /var/run/radvd/radvd.pid).

Files

/usr/bin/radvd
/etc/radvd.conf
/run/radvd.pid
/var/log/radvd.log