> Why wouldn't every device on the internet just spoof their IP if it was this obvious thing? https://spoofer.caida.org/summary.php https://spoofer.caida.org/s

> Why wouldn't every device on the internet just spoof their IP if it was this obvious thing? https://spoofer.caida.org/summary.php https://spoofer.caida.org/summary.php - compromise a device in one of the ASes not marked "unspoofable." Those ASes do not consistently perform packet ingress filtering. That's not to say that DDOS attacks stop being possible, but at least they become traceable.