You need an answer to someone buying $10 of booter time and sending a volumetric attack your way. If any of the traffic is even reaching your server, you've alr

You need an answer to someone buying $10 of booter time and sending a volumetric attack your way. If any of the traffic is even reaching your server, you've already lost, so iptables isn't going to help you because your link is saturated. Cloudflare offers protection for free.