Getting attacked on my Legend of mir3 game server, anyone with these attacks would just block their ports they can flood me with aload of proxys,

for example run gate is 7200 port he floods me, so i change port to something like 45929, 2hours later he floods me again so he can deffinately scan my ports

Im using a Natfirewall, My gaming server has over 80+ users so its kinda popular and gives him a reason to do it

but everytime i change my ports he can some how scan my ports and know witch one, i change the game gates

Yesterday a friend mentioned this

He told me i could use this to stop flood attacks on the gates

But it looks very complicated could anyone give me a simple guuide on how to use it, thanks