In the following diagram, if one NAS, for example
NAS-2, crashes and comes back, it will send system
account-on message for RADIUS server to clean up
previous sessions. But if a RADIUS proxy server is
used in the middle, how can the true RADIUS server
distingush the previous sessions on NAS-2 from
sessions on other NASes?

NAS-1 --|
        |
NAS-2 --|
        |-- Proxy RADIUS Server --True RADIUS Server  

 ...    | 
        |
NAS-N --|


                
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