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Cloud Infrastructure Hardening: Network-Level Traffic Management

How I blocked hostile traffic at the edge and protected application availability.

// Executive Summary

The application was receiving constant automated traffic from a small set of regions, draining resources and putting service reliability at risk.

// The Architectural Bottleneck

The traffic was concentrated enough to cause operational strain, but it was still hard to manage with pure application-level controls.

// Engineering The Solution

I deployed network-layer filtering using IPTables and IPSet directly on the host, which stopped the unwanted traffic before it could reach the web stack.

webhookHandler.jsJavaScript
iptables -A INPUT -m set --match-set bad_regions src -j DROP
iptables -A INPUT -p tcp --dport 80 -j ACCEPT

// Engineering Takeaways

  • Edge-level controls are essential when abuse is coordinated and repetitive.
  • Host-level filtering can be very effective with minimal deployment complexity.
  • Visibility into traffic sources is critical for fast response.