NAME¶
radvd - router advertisement daemon for IPv6
SYNOPSIS¶
radvd [ -hsvc ] [ -d debuglevel ] [ -C
configfile ] [ -p pidfile ] [ -m
logmethod ] [ -l logfile ] [ -f
facility ] [ -t chrootdir ] [ -u
username ]
DESCRIPTION¶
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.
They also can choose a default router based on these advertisements.
Note that if debugging is not enabled,
radvd will not start if IPv6
forwarding is disabled. IPv6 forwarding can be controlled via
sysctl(8),
net.ipv6.conf.all.forwarding on Linux or
net.inet6.ip6.forwarding on BSD.
Similarly, 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.
- -s, --singleprocess
- On Linux if username is specified, privilege separation is enabled
and there will be two processes. This option disables privilege
separation, and as a result, the non-privileged radvd process does not
have permissions to change interface configuration.
- -c, --configtest
- Test configuration and do startup tests and then exit.
- -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
/var/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/sbin/radvd
/etc/radvd.conf
/var/run/radvd.pid
/var/log/radvd.log
BUGS¶
There certainly are some bugs. If you find them or have other suggestions please
contact Pekka Savola <pekkas@netcore.fi>.
SEE ALSO¶
radvd.conf(5),
radvdump(8)
AUTHORS¶
Pedro Roque <roque@di.fc.ul.pt> - wrote first version for Linux
Lars Fenneberg <lf@elemental.net> - previous maintainer
Nathan Lutchansky <lutchann@litech.org> - previous maintainer
Pekka Savola <pekkas@netcore.fi> - current maintainer
Craig Metz <cmetz@inner.net> - port to NRL's IPv6 code for BSD4.4
Marko Myllynen <myllynen@lut.fi> - RFC 2461 update, Mobile IPv6 support
Jim Paris <jim@jtan.com> - Privilege separation support
Reuben Hawkins <reubenhwk@gmail.com> - Many fixes and cleanups
Pierre Ossman <pierre@ossman.eu> - RFC6106 (DNSSL) support