Problem in setting up radius server

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http://www.linuxquestions.org – Iam setting up a radius server in my local network , i have installed free radius for this. The users will be connected to server throgh pppoe connection. I have configured everything and everything seems to works properly except these 2 . 1) If a connecttion gets broken up then radius server is npt able to detect that connection is gone and the user is not able to connect againg for 30 -35 mins as the multiple logins are disable. To make it more clear, suppose a person is connected to my server through lan but du to some reason the lan network was down for 5 to 10 which will result in disc (HowTos)