freeradius with pptp

[Xu Tingting]

Hi everyone,
I have installed freeradius(mysql module) vpn(pptp) servers.
The vpn users are authenticated by username and password in radcheck table,
but not specified a IP address.
In my servers, there are multiple IP address.
When use vpn, my computer shows a constant IP with all vpn accounts.
How can i specify IP for vpn accounts?
What i want is that different vpn users use different IP address.

Could anyone help me?

-- 
Best regards,
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