How nmap hides itself from scanning

192.168.1.216 is a zombie, 192.168.1.212 is the scanned end

nmap -sn 192.168.1.0/24 Scan online hosts

nmap -Pn -sI 192.168.1.216 192.168. 1.212 (-Pn hides itself, -sI idle scan)

IDS can only detect the scan of 192.168.1.212 by 192.168.1.216, but cannot detect the scan of the nmap host.

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