RADCLIENT(1) FreeRADIUS Daemon RADCLIENT(1)
NAME
radclient - send packets to a RADIUS server, show reply
SYNOPSIS
radclient [-4] [-6] [-b] [-c count] [-d raddb_directory] [-D dictio-
nary_directory] [-f file] [-F] [-h] [-i id] [-n num_requests_per_sec-
ond] [-p num_requests_in_parallel] [-q] [-r num_retries] [-s] [-S
shared_secret_file] [-t timeout] [-v] [-x] server {acct|auth|sta-
tus|coa|disconnect|auto} secret
DESCRIPTION
radclient is a radius client program. It can send arbitrary radius
packets to a radius server, then shows the reply. It can be used to
test changes you made in the configuration of the radius server, or it
can be used to monitor if a radius server is up.
radclient reads radius attribute/value pairs from it standard input, or
from a file specified on the command line. It then encodes these attri-
bute/value pairs using the dictionary, and sends them to the remote
server.
The User-Password and CHAP-Password attributes are automatically en-
crypted before the packet is sent to the server.
OPTIONS
-4 Use IPv4 (default)
-6 Use IPv6
-b Enforce the Blast RADIUS checks. All replies to an Access-Re-
quest packet must contain a Message-Authenticator as the first
attribute.
For compatibility with old servers, this flag is not set by de-
fault. However, radclient still checks for the Blast RADIUS
signature, and discards packets which match the attack.
-c count
Send each packet count times.
-d raddb_directory
The directory that contains the user dictionary file. Defaults
to /etc/raddb.
-D dictionary_directory
The directory that contains the main dictionary file. Defaults
to /usr/share/freeradius.
-f file[:file]
File to read the attribute/value pairs from. If this is not
specified, they are read from stdin. This option can be speci-
fied multiple times, in which case packets are sent in order by
file, and within each file, by first packet to last packet. A
blank line separates logical packets within a file. If a pair
of files separated by a colon is specified, the second file will
be used to filter the responses to requests from the first. The
number of requests and filters must be the same. A summary of
filter results will be displayed if -s is passed.
-F Print the file name, packet number and reply code.
-h Print usage help information.
-i id Use id as the RADIUS request Id.
-n num_requests_per_second
Try to send num_requests_per_second, evenly spaced. This option
allows you to slow down the rate at which radclient sends re-
quests. When not using -n, the default is to send packets as
quickly as possible, with no inter-packet delays.
Due to limitations in radclient, this option does not accurately
send the requested number of packets per second.
-p num_requests_in_parallel
Send num_requests_in_parallel, without waiting for a response
for each one. By default, radclient sends the first request it
has read, waits for the response, and once the response is re-
ceived, sends the second request in its list. This option al-
lows you to send many requests at simultaneously. Once num_re-
quests_in_parallel are sent, radclient waits for all of the re-
sponses to arrive (or for the requests to time out), before
sending any more packets.
This option permits you to discover the maximum load accepted by
a RADIUS server.
-P proto
Use proto transport protocol ("tcp" or "udp"). Only available
if FreeRADIUS is compiled with TCP transport support.
-q Go to quiet mode, and do not print out anything.
-r num_retries
Try to send each packet num_retries times, before giving up on
it. The default is 10.
-s Print out some summaries of packets sent and received.
-S shared_secret_file
Rather than reading the shared secret from the command-line
(where it can be seen by others on the local system), read it
instead from shared_secret_file.
-t timeout
Wait timeout seconds before deciding that the NAS has not re-
sponded to a request, and re-sending the packet. The default
timeout is 3.
-v Print out version information.
-x Print out debugging information.
server[:port]
The hostname or IP address of the remote server. Optionally a
UDP port can be specified. If no UDP port is specified, it is
looked up in /etc/services. The service name looked for is
radacct for accounting packets, and radius for all other re-
quests. If a service is not found in /etc/services, 1813 and
1812 are used respectively. For coa and disconnect packets,
port 3799 is used.
If a host name is specified, then radclient will do a DNS
lookup, and use the A record to find the IP address of the RA-
DIUS server. If there is no A record, then radclient will look
for an AAAA record. If there is no AAAA record, an error will
be produced.
IPv6 addresses may be specified by surrounding it in square
brackets. For example, [2002:c000:0201:0:0:0:0:0], or with a
port, [2002:c000:0201:0:0:0:0:0]:18120.
The RADIUS attributes read by radclient can contain the special
attribute Packet-Dst-IP-Address. If this attribute exists, then
that IP address is where the packet is sent, and the server
specified on the command-line is ignored.
If the RADIUS attribute list always contains the Packet-Dst-IP-
Address attribute, then the server parameter can be given as -.
The RADIUS attributes read by radclient can contain the special
attribute Packet-Dst-Port. If this attribute exists, then that
UDP port is where the packet is sent, and the :port specified on
the command-line is ignored.
acct | auth | status | coa | disconnect | auto
Use auth to send an authentication packet (Access-Request), acct
to send an accounting packet (Accounting-Request), status to
send a status packet (Status-Server), or coa to send a CoA-Re-
quest, or disconnect to send a disconnection request. Instead of
these values, you can also use a decimal code here. For example,
code 12 is also Status-Server.
The RADIUS attributes read by radclient can contain the special
attribute Packet-Type. If this attribute exists, then that type
of packet is sent, and the type specified on the command-line is
ignored.
If the RADIUS attribute list always contains the Packet-Type at-
tribute, then the type parameter can be given as auto.
secret The shared secret for this client. It needs to be defined on
the radius server side too, for the IP address you are sending
the radius packets from.
EXAMPLE
A sample session that queries the remote server for Status-Server (not
all servers support this, but FreeRADIUS has configurable support for
it).
$ echo "Message-Authenticator = 0x00" | radclient 192.0.2.42 status s3cr3t
Sending request to server 192.0.2.42, port 1812.
radrecv: Packet from host 192.0.2.42 code=2, id=140, length=54
Reply-Message = "FreeRADIUS up 21 days, 02:05"
SEE ALSO
radiusd(8),
AUTHORS
Miquel van Smoorenburg, miquels@cistron.nl. Alan DeKok <aland@freera-
dius.org>
21 May 2024 RADCLIENT(1)