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Theorically, knowing your ip, people would be able to connect to your fallout 4.

Or practically, if they would scan the entire IPv4 space, which doesn't take too long on a decent connection (5min with 10Gbps, https://zmap.io/)

Wonder if any relevant strings have shown up in Shodan searches yet.

Still, I'd imagine most PCs and game consoles are behind a firewall and ports aren't forwarded.