How to allow certain clients to talk to others in the same IP range when client-to-client communication is prevented?

I have a tap0 VPN working. In order to make the customers not talk I commented the #client-to-client line, it worked.

Now I want to leave some IPs talking to the customers. Eg:10.8.0.2 and 10.8.0.6 can talk to everyone from range 10.8.0.0./24.

How should I do?