Provided by: freeradius-common_3.2.5+dfsg-3~ubuntu24.04.3_all 
NAME
radiusd - Authentication, Authorization and Accounting server
SYNOPSIS
radiusd [-C] [-d config_directory] [-D dictionary_directory] [-f] [-h] [-i ip-address] [-l log_file] [-m]
[-n name] [-p port] [-P] [-s] [-t] [-v] [-x] [-X]
DESCRIPTION
FreeRADIUS is a high-performance and highly configurable RADIUS server. It supports many database back-
ends such as flat-text files, SQL, LDAP, Perl, Python, etc. It also supports many authentication
protocols such as PAP, CHAP, MS-CHAP(v2), HTTP Digest, and EAP (EAP-MD5, EAP-TLS, PEAP, EAP-TTLS, EAP-
SIM, etc.).
It also has full support for Cisco's VLAN Query Protocol (VMPS) and DHCP.
Please read the DEBUGGING section below. It contains instructions for quickly configuring the server for
your local system.
OPTIONS
The following command-line options are accepted by the server:
-C Check the configuration and exit immediately. If there is a problem reading the configuration,
then the server will exit with a non-zero status code. If the configuration appears to be
acceptable, then the server will exit with a zero status code.
Note that there are limitations to this check. Due to the complexities involved in almost
starting a RADIUS server, these checks are necessarily incomplete. The server can return a zero
status code when run with -C, but may still exit with an error when run normally.
See the output of radiusd -XC for an informative list of which modules are checked for correct
configuration, and which modules are skipped, and therefore not checked.
-d config directory
Defaults to /etc/freeradius. Radiusd looks here for its configuration files such as the dictionary
and the users files.
-D dictionary directory
Set main dictionary directory. Defaults to /usr/share/freeradius.
-f Do not fork, stay running as a foreground process.
-h Print usage help information.
-i ip-address
Defines which IP address that the server uses for sending and receiving packets.
If this command-line option is given, then the "bind_address" and all "listen{}" entries in
radiusd.conf are ignored.
This option MUST be used in conjunction with "-p".
-l log_file
Defaults to ${logdir}/radius.log. Radiusd writes it's logging information to this file. If
log_file is the string "stdout" logging will be written to stdout.
-m On SIGINT or SIGQUIT exit cleanly instead of immediately. This is most useful for when running
the server with "valgrind".
-n name
Read freeradius/name.conf instead of freeradius/radiusd.conf.
-p port
Defines which port is used for receiving authentication packets. Accounting packets are received
on "port + 1".
When this command-line option is given, all "listen" sections in radiusd.conf are ignored.
This option MUST be used in conjunction with "-i".
-P Always write out PID, even with -f.
-s Run in "single server" mode. The server normally runs with multiple threads and/or processes,
which can lower its response time to requests. Some systems have issues with threading, however,
so running in "single server" mode may help to address those issues. In single server mode, the
server will also not "daemonize" (auto-background) itself.
-t Do not spawn threads.
-v Print server version information and exit.
-X Debugging mode. Equivalent to "-sfxx -l stdout". When trying to understand how the server works,
ALWAYS run it with "radiusd -X". For production servers, use "raddebug"
-x Finer-grained debug mode. In this mode the server will print details of every request on it's
stdout output. You can specify this option multiple times (-x -x or -xx) to get more detailed
output.
DEBUGGING
The default configuration is set to work in the widest possible circumstances. It requires minimal
changes for your system.
However, your needs may be complex, and may require significant changes to the server configuration.
Making random changes is a guaranteed method of failure. Instead, we STRONGLY RECOMMEND proceeding via
the following steps:
1) Always run the server in debugging mode ( radiusd -X ) after making a configuration change. We cannot
emphasize this enough. If you are not running the server in debugging mode, you will not be able to see
what is doing, and you will not be able to correct any problems.
If you ask questions on the mailing list, the first response will be to tell you "run the server in
debugging mode". Please, follow these instructions.
2) Change as little as possible in the default configuration files. The server contains a decade of
experience with protocols, databases, and different systems. Its default configuration is designed to
work almost everywhere, and to do almost everything you need.
3) When you make a small change, testing it before changing anything else. If the change works, save a
copy of the configuration, and make another change. If the change doesn't work, debug it, and try to
understand why it doesn't work.
If you begin by making large changes to the server configuration, it will never work, and you will never
be able to debug the problem.
4) If you need to add a connection to a database FOO (e.g. LDAP or SQL), then:
a) Edit freeradius/modules/foo
This file contains the default configuration for the module. It contains comments describing what can
be configured, and what those configuration entries mean.
b) Edit freeradius/sites-available/default
This file contains the default policy for the server. e.g. "enable CHAP, MS-CHAP, and EAP
authentication". Look in this file for all references to your module "foo". Read the comments, and
remove the leading hash '#' from the lines referencing the module. This enables the module.
c) Edit freeradius/sites-available/inner-tunnel
This file contains the default policy for the "tunneled" portion of certain EAP methods. Perform the
same kind of edits as above, for the "default" file.. If you are not using EAP (802.1X), then this
step can be skipped.
d) Start the server in debugging mode ( radiusd -X ), and start testing.
5) Ask questions on the mailing list (freeradius-users@lists.freeradius.org). When asking questions,
include the output from debugging mode ( radiusd -X ). This information will allow people to help you.
If you do not include it, the first response to your message will be "post the output of debug mode".
Ask questions earlier, rather than later. If you cannot solve a problem in a day, ask a question on the
mailing list. Most questions have been seen before, and can be answered quickly.
BACKGROUND
RADIUS is a protocol spoken between an access server, typically a device connected to several modems or
ISDN lines, and a radius server. When a user connects to the access server, (s)he is asked for a
loginname and a password. This information is then sent to the radius server. The server replies with
"access denied", or "access OK". In the latter case login information is sent along, such as the IP
address in the case of a PPP connection.
The access server also sends login and logout records to the radius server so accounting can be done.
These records are kept for each terminal server separately in a file called detail, and in the wtmp
compatible logfile /var/log/radwtmp.
CONFIGURATION
Radiusd uses a number of configuration files. Each file has it's own manpage describing the format of the
file. These files are:
radiusd.conf
The main configuration file, which sets the administrator-controlled items.
dictionary
This file is usually static. It defines all the possible RADIUS attributes used in the other
configuration files. You don't have to modify it. It includes other dictionary files in the same
directory.
hints Defines certain hints to the radius server based on the users's loginname or other attributes sent
by the access server. It also provides for mapping user names (such as Pusername -> username).
This provides the functionality that the Livingston 2.0 server has as "Prefix" and "Suffix"
support in the users file, but is more general. Of course the Livingston way of doing things is
also supported, and you can even use both at the same time (within certain limits).
huntgroups
Defines the huntgroups that you have, and makes it possible to restrict access to certain
huntgroups to certain (groups of) users.
users Here the users are defined. On a typical setup, this file mainly contains DEFAULT entries to
process the different types of logins, based on hints from the hints file. Authentication is then
based on the contents of the UNIX /etc/passwd file. However it is also possible to define all
users, and their passwords, in this file.
SEE ALSO
radiusd.conf(5), users(5), huntgroups(5), hints(5), dictionary(5), raddebug(8)
AUTHOR
The FreeRADIUS Server Project (http://www.freeradius.org)
26 Apr 2012 RADIUSD(8)