Mike thanks for the reply.

I have ser with radius which using mysql.
So i put in radgroupcheck attribute 
Simultaneous-Use := 1
And i am trying to check the logs of the radius,for some reason i am
not receiving any "REGISTER" requests from my cisco 7960 ip phone.
(Authentication requests)

Any idea about this problem ? 

On Sun, 13 Feb 2005 20:09:40 +1100, Michael Mitchell
<[EMAIL PROTECTED]> wrote:
> Do you mean using the same username at the same time, or ever?
> 
> A couple of things come to mind:
> 
> 1. Enable Simultaneous-Use checking to allow only one session per user
> at any one time.
> 
> 2. Use the Calling-Station-Id attribute in your authorization - ie, the
> user must call from this phone number or modem mac address depending on
> the access type (dialup/DSL/etc). Not sure if this has legal
> consequences with privacy laws though...
> 
> Not sure if there is anything else you can do???
> 
> Mike
> 
> 
> Alex wrote:
> > Hi all.
> >
> > I have a question.
> > I would like to know how i can prevent using the same username and
> > password through the radius.
> >
> > If i have 2 users who takes the same username and password, both of
> > them pass authentication, If there any possibility to disable 2-nd.
> >
> > The goal is to prevent fraud and using the same username and password.
> >
> > Thanks.
> >
> 
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