By forcing scanning tools to use specific source ports—such as Port 53 (DNS) or Port 20 (FTP Data)—traffic can sometimes bypass inbound filtering rules that blindly trust those legacy ports. 3. Bypassing Intrusion Detection Systems (IDS)

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Understanding evasion techniques is critical for building resilient networks. However, these methodologies must only be practiced within strict legal frameworks.

: Specifying the exact path a packet should take through the network to bypass a firewall positioned on the default route.

Spoofing hides the tester's true IP address by forging the packet headers. During reconnaissance, researchers use decoys to blend malicious scans into a crowd of legitimate traffic. This makes it difficult for the firewall to automatically block the true source.