how to disable double connection

[Tseveendorj]

Hello,

I'm providing internet to customers via ADSL2+. I have cisco router and 
FreeRADIUS 2.1.3.
Customer can make double connection via PPPoE.
How to disable double connection ?
What kind of attribute can do that ?

Thanks for any help.

Sincerely,
Tseveen.




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