Only allow a client to access other customers

[rbarone]

I have installed OpenVPN on a server in the cloud, and over 30 clients connected to this VPN.
Today all clients can access the server and connect between them, but I need to block access between them.
Need only the server can access clients and customers can not access each other.
I made the configuration enabling the client-to-client and functions as necessary for the environmental work, but beyond this configuration would like you to know if you can help it beyond the server access customers, one of the customers be allowed to access all others?

SERVER > CUSTOMERS (SERVER CLIENT ACCESS)
CUSTOMERS > CUSTOMERS (NOT ACCESS CUSTOMER CUSTOMER)

NECESSARY ENVIRONMENT

SERVER > CUSTOMERS
129.10.0.1 129.10.0.X

The server can access the customer

customer1 CUSTOMERS
129.10.0.6 > 129.10.0.X

Only the client IP 129.10.0.6 can access other customers.


It's possible ? can you help me ?