[Dagger2]

You have to do that with range bans in v4 too, since you have no idea how big the pool of addresses a user can pull from is -- and with CGNAT in the picture you're kind of doomed to banning legitimate customers on v4 no matter what you do.

[will4274]

Yes, you ban some legitimate customers with v4. But the span between the smallest allocations and biggest allocations is much smaller, so simple strategies (like banning the bad address) scale further.