I need some informations about how a country like ...Italy, UK,.. can block the access to a site of its country(under .it domain) to a the foreign host.
for example: The state "Italy" have a internet game that is legal for the people that lives in Italy, but it doesn't want that foreign people the lives in others country can access to this game.
How it can do this? (I need specific technique not political consideration). I have thinked about the dual thing, the case in which a country wants to block the access to a foreign site for its citizens...The state can impose, obligue the ISP to not respond to the Dns query to the specip game site...
Can you help me? Have you got a link that can help me?