Understanding Forward and Reverse Proxies: How They Filter Traffic and Block Malware

Short summary

A detailed explainer on how proxies work at Layer 7 of the OSI model, covering forward proxies for corporate security, reverse proxies for penetration testing, and transparent vs non-transparent proxy modes. It explains how forward proxies block malware C2 communication and why Firefox's independent proxy handling differs from Windows system proxy settings. The post also covers how penetration testers use reverse proxies to bypass firewalls and evade IDS via SSH tunnels.

• •Forward proxies inspect and route client traffic, blocking malware from direct C2 communication
• •Firefox ignores Windows system proxy settings, using its own networking code (libcurl)
• •Reverse proxies help penetration testers bypass firewalls and evade intrusion detection systems

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