Topic: Expand IP Range

How can I expand the IP range over 256 hosts.

I made net 192.168.0.0/20 but I can ping the server just on same subnet, example:

Chilli 1 : 192.168.0.1 - Clients 192.168.0.2-192.168.0.254
Chilli 2 : 192.168.1.1 - Clients 192.168.1.2-192.168.1.254

and so on.....

How to expand all 4096 addresses oh 255.255.240.0 network on just one Chilli server?

Regards