06-21-2018
In addition to what Bakunin said:
A firewall drops or rejects a connection after a certain period if there is no activity.
A keep-alive message can be sent as a null packet periodically by the client to keep a service alive. This keeps the firewall from dropping the connection. Of course if this is done liberally by every host for every connection then the connection table in the firewall would become too long. That is why some firewalls detect this behavior and ignore keepalives messages.
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LEARN ABOUT CENTOS
radtest
RADTEST(1) FreeRADIUS Daemon RADTEST(1)
NAME
radtest - send packets to a RADIUS server, show reply
SYNOPSIS
radtest [-d raddb_directory] [-t pap/chap/mschap] [-x ] [-4 ] [-6 ] user password radius-server nas-port-number secret [ppphint] [nasname]
DESCRIPTION
radtest is a frontend to radclient(1). It generates a list of attribute/value pairs based on the command line arguments, and feeds these
into radclient. It's a fast and convenient way to test a radius server.
OPTIONS
-d raddb_directory
The directory that contains the RADIUS dictionary files. Defaults to /etc/raddb.
-t pap/chap/mschap/eap-md5
Choose the authentiction method to use. e.g. "-t pap", "-t chap", "-t mschap", or "-t eap-md5",. Defaults to "pap". Using EAP-MD5
requires that the "radeapclient" program is installed.
-x Enables debugging output for the RADIUS client.
-4 Use NAS-IP-Address for the NAS address (default)
-6 Use NAS-IPv6-Address for the NAS address (default)
user Username to send.
password
Password of the user.
radius-server
Hostname or IP address of the radius server. Optionally, you may specify a port by appending :port
nas-port-number
The value of the NAS-Port attribute. Is an integer between 0 and 2^31, and it really doesn't matter what you put here. 10 will do
fine.
secret The shared secret for this client.
ppphint
If you put an integer > 0 here, radtest (or actually radclient) will add the attribute Framed-Protocol = PPP to the request packet.
nasname
If present, this will be resolved to an IP address and added to the request packet as the NAS-IP-Address attribute. If you don't
specify it, the local hostname of the system will be used.
SEE ALSO
radiusd(8), radclient(1).
AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl.
5 April 2010 RADTEST(1)