How to prevent ping of death attack?
I found a video in which they talk about crashing a website with a Ping Of Death (PoD) attack, using cmd only. How to secure a website against this type of denial-of-service (DoS) attack? I assume it's harder to protect against it since anyone can perform such an attack.
It's not necessary to prevent Ping of Death attacks. Operating systems no longer freak out when assembling large fragmented ICMP packets. That video is trying to demonstrate a ping flooding attack, a DoS attack in which he's trying to send more ICMP packets than what the server can handle. Chances are that the server being "attacked" has a bigger downlink than the attacker's uplink. To learn about mitigating DDoS attacks, you can start by checking this question about different techniques used by firewalls.