What happens during a DDoS attack and how to distinguish an attack from normal load

▤ Summary

This article explains how to distinguish DDoS traffic from normal load on VDS/VPS servers. It covers common attack patterns such as SYN floods, UDP floods, ICMP floods, and Layer 7 HTTP attacks like Slowloris and RUDY. It also shows how to inspect server metrics, logs, conntrack tables, and packet captures to confirm attack behavior. The piece recommends mitigation steps such as SYN cookies, iptables/nftables rules, and monitoring tools like Suricata, CrowdSec, Netdata, and vnStat.

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