IP Spoofing
IP spoofing forges the source IP address of packets so that traffic appears to originate from another address.
Mechanism
Because source addresses are not inherently proof of identity, defenders use ingress/egress filtering and higher-layer authentication to establish trust.
Indicators to watch
Traffic with impossible source networks, internal addresses arriving from external interfaces, asymmetric routing anomalies, and inconsistent flow behavior.
Concept diagram
Defensive controls
Use ingress/egress filtering, anti-spoofing ACLs, authenticated protocols, and network segmentation.
Recommended security control
Firewall anti-spoofing / NetFlow
Study with packet captures rather than sending spoofed traffic onto real networks.
Defense tool
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All attack descriptions are for defensive education. Test scanning, traffic generation, interception, wireless testing, and vulnerable applications only on systems and networks you own or are explicitly authorized to assess.