Depends on what you mean by "ranges". The problem is that all the definitions of ranges I can think of can be firewalled using wildcards ( as in firewall 192.168.*.* for example, and possibly even down to as fine as firewall 192.168.??1.1??, but not sure of that part). The larger issue is that you can actually easily (accidentally or on purpose) firewall entire countries that way.
Maybe I don't understand what you need, but there is no sure/safe way to firewall anyone if they really want to get on without firewalling hundreds and/or thousands of people at the same time.
|