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System Design Masterclass · Security Testing Operations
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An IDS sees a injection attack in progress and sends an alert. By the time an analyst reads the alert, the attacker has already exfiltrated the database. An IPS sees the same attack and drops the malicious packets before they reach the application. The attack never succeeds.
IPS operates inline in the network path. All traffic passes through it. When a packet matches a malicious signature, the IPS drops it, resets the connection, or redirects the traffic in real-time. The server never sees the attack. This inline position is what makes IPS fundamentally different from IDS.
Palo Alto Networks, Cisco Firepower, Fortinet FortiGate, and Snort/Suricata in inline mode are the major IPS options. Hardware-accelerated models handle 40+ Gbps with sub-millisecond . Software-based IPS (Suricata inline, Snort inline) runs on standard hardware and handles 1-10 Gbps depending on rule count and CPU cores.
Web Application Firewalls (WAFs) are specialized IPS for traffic. Cloudflare WAF, AWS WAF, ModSecurity, and F5 ASM understand HTTP semantics and block SQL injection, XSS, CSRF, and path traversal at the application layer. A general IPS inspects at the network and transport layers (L3/L4). A WAF inspects at the application layer (L7) with deep HTTP understanding.
The trade-off is clear: an IPS that incorrectly identifies legitimate traffic as malicious (false positive) blocks real users and causes a self-inflicted outage. This is the fundamental tension of inline security. IDS has zero risk of blocking. IPS has blocking power but carries the risk of self-inflicted outages from false positives.