@commandncode: Linux tracks IP-to-MAC reachability using NUD (Neighbor Unreachability Detection) states. Entries transition through INCOMPLETE, REACHABLE, STALE, DELAY, PROBE, and FAILED based on traffic and ARP responses. These state transitions help Linux detect unreachable neighbors while minimizing unnecessary ARP traffic. #linux #software #computerscience #programming #cybersecurity

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Saturday 24 January 2026 19:41:52 GMT