alt Hacker Newscant you just disable resedential and non critical connections? ISPs etc. know whos who right? no need to take the nation offline. only the people in it (civilians, medium/small businesses etc)
u could likely also readonable tell if someone would be enabling others via their access without even inspecting the actual traffic
Russia is trying that (white lists) and it's proving costly enough that even they have to back off. They'll probably get there eventually but it requires serious investment of money and time and inevitably hampers the economy.