by default client-to-client connectivity is disabled for security purposes.
you can either setup an iptables rules to allow this type of traffic
iptables -I FORWARD -i tun+ -j ACCEPT
iptables -I FORWARD -o tun+ -j ACCEPT
or you can add
client-to-client
to the server config - the latter will be faster, as it will bypass ALL iptables rules. It does mean that you no longer have control over what is sent from client to client.
