ok, it's right..., thanks... but, I have another qastion ! I configue a subnet mask (..../16), like 255.255.0.0 and a MT (in DHCP) give to DHCP client sub 255.0.0.0 , why ? Can I make a something, to protect a network, that My client's can't change a IP addresses ? for example, in My network, some l...