How to enable DDoS protection?

Question

DDoS (Distributed Denial of Service Attacks) are generally blocked on a server level right?

Is there a way to block it on a PHP level, or at least reduce it?

Answer 1

DDoS is best handled by very expensive, purpose-built network appliances. Hosts are generally not good at doing DDoS protection because they are subject to relatively low performance, state exhaustion, limited bandwidth, etc. Use of iptables, apache mods, and similar services can help in some situations if you have no access to DDoS mitigation hardware or a DDoS mitigation service, but it is far from ideal and still leaves you at risk of attack.