2 clients could not see each other

clouds.flowing at gmail.com (Clouds Flowing) · Wed, 31 May 2017 21:14:57 +0800

I've configured ocserv as

ipv4-network = 172.24.9.0/24
dns = 172.24.9.1
route = 172.24.9.0/255.255.255.0

and after connected to server, my 2 devices got ip 172.24.9.20 and 172.24.9.21,
I could ping from any of clients to the server (172.24.9.1), and from
the server to any clients,
But I could not successfully ping from one client to another, (e.g. I
could not ping 172.24.9.20 from 172.24.9.21).

Is there anything I missed in configuration?

I'm using "ocserv 0.11.6" on linux and "Cisco AnyConnect Secure
Mobility Client 4.4.02034"

Thanks,
Clouds