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Firewalls and intrusion detection systems often block ICMP (ping) requests to prevent unauthorized network reconnaissance. This can make it challenging to identify live hosts using standard scanning techniques. However, Nmap provides several methods to bypass these restrictions and discover active systems even when ICMP is blocked. In addition, Nmap’s Scripting Engine (NSE) allows users to perform advanced network discovery, vulnerability detection, and even exploit automation. This module covers techniques to bypass ping blocking and use NSE effectively.
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