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There are different ways of building your own anti-DDoS rules for iptables. We will be discussing the most effective iptables DDoS protection methods in this comprehensive tutorial. Please note that this article is written for professionals who deal with Linux servers on a daily basis. Most UDP-based attacks are amplified reflection attacks that will exhaust the network interface card of any common server. The only mitigation approach that makes sense against these types of attacks is to block them at the edge or core network or even at the carrier already. To understand why your current iptables rules to prevent DDoS attacks suck, we first have to dig into how iptables works. There are different tables for different purposes. If a packet creates a new connection, the nat table gets checked for rules.