You block volumetric attacks by filtering the payload, not by blocking IP's. If you block by IP, you're going to have a lot of upset customers. Also, what are y

You block volumetric attacks by filtering the payload, not by blocking IP's. If you block by IP, you're going to have a lot of upset customers. Also, what are you going to do on an IPv6 attack? Block the entire /64? Unlikely. Also remember that a single IP doesn't always mean a single user for IPv4. An IP might represent several thousand customers in the case of NAT and especially CGNAT. If the traffic is indistinguishable from normal traffic via L3/L4, then it's a layer 7 attack, which cannot be spoofed. You're not dealing with spoofing in a L7 attack. The first D in DDoS stands for distributed. Even terabit sized attacks are easy to stop if they're sufficiently distributed (the attack is geographically dispersed enough to be diffused). It's when you get a terabit from a handful of AS's (like in S. Korean attacks) that you can feel pain. Even then, it usually only knocks out access in that part of the world, but not everyone. IP's will not be sticky. IPv6 is showing why it's important to not be sticky. Ending spoofing isn't going to stop DDoS attacks. I've got 10+ years of experience on the subject, and I'll gladly answer any questions you might have.