How to separate users to different server...

[Spacelee]

Environment: PPTP+PPP+FREERADIUS+MYSQL+LINUX
I want to separate users, for example, there are 10 users
user1, user2 ... user10
I want user1, user2 ... user5 can only login server1
I want user6.................user10 can only login server2
if user1 login server2, could I sent a login failure? How to finish this
task...

Thanks...

-- 
Spacelee
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