Hello,
I'm not really experienced with FR, but maybe this is enough to help you.
> 3) How does it maintains database does it uses SQL, if so ? whether
it provides any
> alternative to maintain database of username and password ? for
example like by using files….. etc.
FR is able to store users and their attributes in a couple of backends
including sql database and a users text file. See the modules section of
radiusd.conf for more information.
1) What is the maximum length of username and password allowed in
freeRADIUS ?
That probably depends on the backend you're using, or look in
http://www.freeradius.org/rfc/rfc2865.html if there's a limit.
2) What is the maximum number of users allowed to authenticate? I
mean, how many users does it maintains in its database?
I guess that's a question of performance first. Propably all backends
can store _enough_ users and FR can also handle them.
4) Is there any necessity or possibility to use secondary RADIUS server ?
Technically it's not necessary. But if you use it for something
important it's obvious better to have one... ;-) It's possible of course
to set up 2 RADIUS servers.
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