#34 netmask restriction

[Mario Dragone]

When creating networks, I would like to specify a mask,
not a netmask.

For example, I would like to specify :
10.0.1.0/255.0.255.0 as the student networks :

- 10.1.1.0 student network on site A
- 10.2.1.0 student network on site B, and so on

Theses masks are valid inside iptables rules and they
simplify rules.

regards