2.3. Net

A net is identified by a network address and a netmask which determine the network dimension.

The netmask can be expressed by four numbers (0-255) separated by a dot (ex. 255.255.255.0) or simply by the number of binary digits that are part of the network address (ex. 24).

For more information visit this URL: http://netfilter.samba.org/documentation/HOWTO//networking-concepts-HOWTO-4.html#ss4.1

Likewise we saw for the zones, if you want to create a new net you have to click on "Create new net".

Now you can set a name for the net (ex. internal_net, subnet1, etc.), a network address (ex. 192.168.0.0), a netmask (es. 255.255.0.0) and, in the end, set the zone this subnet belong to (ex. good).

You should remember that you cannot define a net until you have declared the zone it belong to.