e75b2c4775ccebf87904b54ed978590d96fc3c2b
Kernel fires RTM_NEWNEIGH for NUD_STALE, NUD_DELAY, and NUD_PROBE states as it probes a potentially-departed device. Each probe was calling on_arrival() which refreshed last_seen, preventing the watchdog from ever detecting departure. Only NUD_REACHABLE confirms a device is actually on the network.
Description
Network drop implant — passive SOC + active exploitation. Deploy on any Debian host.
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