I have a small server at home that I plan on putting a few game servers on, but I want to make sure only people from my country can join it.
Is it possible to filter connection attempts to my server based on port? Say a game runs on port 12345, could I block all international traffic to that single port?
Answer
Well, of course it is possible, you simple need a database like Maxmind or IPLocation (http://www.ip2location.com), there you will find the information needed.
Regarding the port, you can use any opensource firewall to filter any access to that port coming from outside your country.
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