Answer bellow:

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De: freeradius-users-bounces+listas.nata=cnett.com.br@lists.freeradius.org [mailto:freeradius-users-bounces+listas.nata=cnett.com.br@lists.freeradius.org] Em nome de adx grave
Enviada em: segunda-feira, 10 de outubro de 2011 20:37
Para: FreeRadius users mailing list
Assunto: Re: Trying to solve a Simultaneous-Use problem

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You mean use simultaneous-use = 1? You can use unlang. Assume NAS01 is now dead. There's a stalled session in db. When user try to login using NAS02, check for his username and fill the session to eliminate it.

[Nataniel Klug] Yes, I am using “Simultaneous-Use := 1” in my configuration. I was reading about this “unlang” and could not understand how to use it… It would be a “redundant” client?

http://freeradius.org/radiusd/man/unlang.html

http://wiki.freeradius.org/Unlang