u/Z-Fennec

So I put my PC in IP passthrough and I also tried Default Server. My intention was to put my PC in the DMZ sense the two games I play have a port that is reserved for the Modem. I turned both off and my games improved to which I have no idea how. My ping is always relatively low in the 30's to 40's but It feels much better when I have them off.

My question is how does putting my PC in these setting impact its performance and if its supposed to be better why is it worse.