[Golden]

Yes actual PUBLIC accesible are most a magnet of ddos attacks. If your new and have like 5 players a day probably ok. But when you get the switch on of traffic. Definantely you need to take extra action agains abusers.

Most attacks come from USA, Russia and China from what I have read about. If you want to restrict your server to specific people or locations you can use IP range in your firewall. Unwanted users won't be able to DDoS your server how hard they try because their connections will be refused. You should do this if you aren't thinking about making your game public though xD