Chapter 2. Network Information Gathering

In this chapter, we will cover the following recipes:

  • Discovering live servers over the network
  • Bypassing IDS/IPS/firewall
  • Discovering ports over the network
  • Using unicornscan for faster port scanning
  • Service fingerprinting
  • Determining the OS using nmap and xprobe2
  • Service enumeration
  • Open-source information gathering

Introduction

In this chapter, we will look at how to detect live servers and network devices over the network, and perform service fingerprinting and enumeration for information gathering. Gathering information is of the utmost importance for a successful vulnerability assessment and penetration test. Moving forward, we will run scanners to find vulnerabilities in the detected services. Along with that, we will write bash scripts so that we can speed up the process of discovery-enumerate-scan.

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