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IP spoofing on the public Internet has become difficult because most ISPs take countermeasures to prevent it.
There isn't much one can do to screw with people's games, unless they control a router between the victim and the server. This in practice means the attacker would need to be (or have the powers to compel) an internet service provider or be on the ...
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The most likely way such packets could occur is through cheats that people would code for your game. Either the cheat would hijack the connection on the client's side and send duplicate packets, or your client itself would be compromised by the cheat and send whatever the cheater wanted. No amount of encryption can protect against that, but what helps ...
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