Password Synchronization

["ali jinx" <archiver db geocrawler com>]

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Hello,
   I'm working on a ISP setup. I have 4 servers running on RedHat Linux 6.1 ,each running 
different services. I want my users to change their password through telnet port on server-1 but 
the password has to be changed on every machine i.e, server-2,3,4,5 in real-time. This will be 
transparetnt to the user. The user will only to a single machine and change his password so 
transparetnly changing the password on every machine. Any Solution??????????

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