RADVD(8) RADVD(8) # [NAME](#NAME) radvd - router advertisement daemon for IPv6 # [SYNOPSIS](#SYNOPSIS) **radvd** **\[ -hsvc ]** **\[ -d debuglevel ]** **\[ -C configfile ]** **\[ -p pidfile ]** **\[ -m logmethod ]** **\[ -l logfile ]** **\[ -n nodaemon ]** **\[ -f facility ]** **\[ -t chrootdir ]** **\[ -u username ]** # [DESCRIPTION](#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. It also defines "Neighbor Discovery Optimization for IPv6 over Low-Power Wireless Personal Area [Networks (6LoWPANs)](/man/enterprise-packages/radvd/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](#OPTIONS) For every one character option there is also a long option, which is listed right next to the "short" option name: [**-v**, **--version**](#v) Displays the version of *radvd* and then aborts. [**-h**, **--help**](#h) Displays a short usage description and then aborts. [**-c**, **--configtest**](#c) Test configuration and do startup tests and then exit. [**-n**, **--nodaemon**](#n) Prevent the daemonizing. [**-d** debuglevel, **--debug** debuglevel](#d) 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](#C) Specifies an alternate config file. Normally the compiled in default */etc/radvd.conf* is used. [**-p** pidfile, **--pidfile** pidfile](#p) Specifies an alternate pidfile. Normally the compiled in default */var/run/radvd.pid* is used. [**-m** method, **--logmethod** method](#m) Specifies the logging method to use. Possibly values are: [**none**](#none) Completely disables any logging. [**logfile**](#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**](#stderr) Logs to standard error. [**stderr\_syslog**](#stderr_syslog) Logs only the high messages (of at least LOG\_ERR priority) to standard error, and everything to syslog (default method). [**syslog**](#syslog) Logs to syslog. [**-l** logfile, **--logfile** logfile](#l) Specifies the logfile to use when using the logging method *logfile*. The default logfile is */var/log/radvd.log*. [**-f** facility, **--facility** facility](#f) Specifies the facility (as an integer) when using syslog logging. Default is LOG\_DAEMON. [**-t** chrootdir, **--chrootdir** chrootdir](#t) 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](#u) 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](#FILES) ``` /usr/bin/radvd /etc/radvd.conf /var/run/radvd.pid /var/log/radvd.log ``` # [BUGS](#BUGS) There certainly are some bugs. If you find them or have other suggestions please send to https://github.com/radvd-project/radvd/issues # [SEE ALSO](#SEE_ALSO) [**radvd.conf**(5)](/man/enterprise-packages/radvd/radvd.conf.5), [**radvdump**(8)](/man/enterprise-packages/radvd/radvdump.8) # [AUTHORS](#AUTHORS) ``` Pedro Roque - wrote first version for Linux Lars Fenneberg - previous maintainer Nathan Lutchansky - previous maintainer Pekka Savola - previous maintainer Craig Metz - port to NRL's IPv6 code for BSD4.4 Marko Myllynen - RFC 2461 update, Mobile IPv6 support Jim Paris - Privilege separation support Reuben Hawkins - previous maintainer Pierre Ossman - RFC6106 (DNSSL) support Varka Bhadram - 6LoWPAN-ND (RFC6775) support Robin H. Johnson - current maintainer, RA splitting per RFC 6980 & RFC4861#6.2.3 Radek Zajic - NAT64 pref64 support (RFC8781) Geert Stappers - contributor ``` 30 Dec 2024 radvd 2.21 --- Document: radvd(8) from radvd 2.21-r1 (Chainguard OS)