Kali Linux:An Ethical Hacker's Cookbook
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Bypassing firewalls with Nmap

Most of the time during a pentest, we will come across systems protected by firewalls or Intrusion Detection Systems (IDS). The Nmap provides different ways to bypass these IDS/firewalls to perform port scans on a network. In this recipe, we will learn some of the ways we can bypass firewalls.