I know that it is a very noob question but I don't how to solve this. I'm using a windows machine with the following network settings:

IP: 192.168.0.104
Mask: 255.255.255.0
Default gateway: 192.168.0.1

I need to ping a development board which have the IP 192.168.7.2, but it always return "Request timed out".

I guess I need to change the mask in order to reach the board, but what mask should I use?

Thanks