Firewall Basic Bypassing Techniques With Nmap and Hping3

Data security is a top priority for systems administrators. Systems admins always try to keep ports closed for public use, which is not required. There are many firewall solutions available on the market, starting from simple iptables and ending with complex cloud solutions. In our current case, we will take a look at several interesting tools like Nmap and hping and methods on how to find out if a port is actually used by something.

Nmap

The first tool we will try is Nmap. It provides numerous features to assist in mapping and grasping intricate networks. One of the ideal techniques of understanding network security from the sysadmin or penetration tester’s perspective is the attempt to surmount it. Firewalls can attempt to render the reconnaissance phase and Nmap's scanning capabilities less efficient for the adversary.

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