What kind of cheats?

@1ronKeys i forgot to mention : can be also your firewallsettings preventing those packets getting to you, since strict firewall rules might only relay packets that got initiated from your pc as an answer but no packets that have their origin with the server.
Thats why its recommended to have a portforwarding set up that suits the games needs.
In times with IPv4 Shortage this gets near to impossible to be solved on your end, if you got a "Dual Stack Lite" connection from your provider.
Thats why i cant understand why game developers still rely on IPv4 in favor of IPv6 ...