Tom Reed wrote: > > > > If I know the network addr: 192.168.1.0 > And know the broadcast addr: 192.168.1.255 > Then I should have the possibility to cal the netmask addr: 255.255.255.0 > > Isn't it? No. What's the netmask if you have: IP: 192.168.255.132 broadcast: 192.168.255.255 ? -dsr-