rad-client - A command line RADIUS client


    rad-client --secret secret --server server --dictionary dictfile ... 
    [--attempts n] [--timeout t] [--port port] [--code packet-code] 
    [--authenticator packet-authenticator] [--identifier id] [--prompt]
    [--attributes file] [--nowait] [--dump-request] [--quiet] [--help]


rad-client is a command-line RADIUS client that is expected to be flexible enough so as to allow for testing of servers and automating monitoring scripts. This script ships as part of Net::Radius::Server(3).

Basically, this script will craft a RADIUS packet, send it to the specified server and wait for a response (unless --nowait is specified, see below).

The following options are supported (Options can be shortened - See Getopt::Long(3)):

--attempts n

Specify the number of attempts to send the RADIUS packet to the server. This defaults to the magical number, 3. Retransmissions are reported to STDERR unless --quiet is specified.

--timeout t

How much to wait for an answer before retrying, in seconds. Defaults to 3 seconds. Timeouts are reported to STDERR unless --quiet is specified.


Causes rad-client to forego waiting for the response. This may be useful for some test scenarios. No retransmissions occur when this option is specified, so only one packet is sent.

--server server

Surprisingly, the server address to which to send the RADIUS packets.

--port port

Correct. This is the server port where RADIUS packets should be sent. Defaults to 1812.

--secret secret

The RADIUS shared secret used for packet authentication.

--prompt [attribute]

Prompt the user and add a password-encoded RADIUS attribute to the request. By default, this works in the RADIUS attribute 2.

--dictionary dictfile...

Specifies one or more dictionary files to use for crafting the RADIUS packet and for decoding the eventual response. Multiple files can be specified, causing the dictionaries to be loaded in order.

--code code

The RADIUS packet code. Defaults to 'Access-Request'.

--authenticator auth

Specifies the RADIUS packet authenticator. The authenticator defaults to a semi-random string composed of printable characters, which seems nice in the packet dumps.

Note that a great deal of the (limited) security of RADIUS depends on the use of strong authenticator strings, which should be random and unrelated to the request they're protecting. The implementation used in this script is NOT secure, as there is little randomness.

--identifier id

Specifies the RADIUS packet identifier. This defaults to a random number between 1 and 255.

--attributes file

Parse attributes from the given file, where they must be specified one per line. Comments following Perl syntax are allowed in said file. Additional attributes can be specified in the command line.

The special file "-" means, as expected, to read STDIN.


Causes the packet that rad-client crafted to be dumped to STDOUT before sending it.


Supress warnings and indications.


Shows this documentation, then exits.

RADIUS attributes are specified either in the command line or in the file specified with the --attributes option, as follows:


Where vendor and attribute are the labels specified in the dictionary.

If the packet code is 'Access-Request' (or another packet code requiring a password attribute), the special attributes 'Password' and 'User-Password' (with no vendor), will be encoded with the shared secret before sending the packet, as expected.

Any received packets will be dumped to STDOUT using Net::Radius::Packet->dump.


    Revision 1.3  2006/11/15 00:08:46  lem
    rad-client can now prompt for attribute values...

    Revision 1.2  2006/11/09 16:24:05  lem

    Only encode User-Password on packet codes other than Access-Request

    Revision 1.1  2006/11/09 10:28:47  lem

    Added rad-client to the distribution


This code and all accompanying software comes with NO WARRANTY. You use it at your own risk.

This code and all accompanying software can be used freely under the same terms as Perl version 5.8.6 itself.


Luis E. Muñoz <>


perl(1), Getopt::Long(3), Net::Radius::Server(3).

1 POD Error

The following errors were encountered while parsing the POD:

Around line 403:

Non-ASCII character seen before =encoding in 'Muñoz'. Assuming UTF-8