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Network Scanning Cookbook

You're reading from Network Scanning Cookbook Practical network security using Nmap and Nessus 7

Product type Paperback

Published in Sep 2018

Publisher Packt

ISBN-13 9781789346480

Length 304 pages

Edition 1st Edition

Tools

Nessus

Concepts

Network Security

Author (1):

Sairam Jetty

View More author details

Table of Contents (10) Chapters

Preface

1. Introduction to Network Vulnerability Scanning

2. Understanding Network Scanning Tools FREE CHAPTER

3. Port Scanning

4. Vulnerability Scanning

5. Configuration Audits

6. Report Analysis and Confirmation

7. Understanding the Customization and Optimization of Nessus and Nmap

8. Network Scanning for IoT, SCADA/ICS

9. Other Books You May Enjoy

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How to detect and bypass network protection systems

The basic function of Nmap is to generate custom packets and analyze their response once they are sent to the remote hosts. This sometimes is not allowed by network protection systems such as firewalls and intrusion prevention and detection systems. In this recipe, we will discuss some of the methods that can be used to bypass these protections:

-f (Fragment packets): Most firewalls perform stateful and stateless packet inspection for which they examine the content of the packets and decide whether to allow the packet or drop it based on its contents. In order to bypass this, Nmap provides an option to fragment the packets so that the network device will not be able to construct the packet to read the correct contents, thereby bypassing the protection.
--mtu (Maximum transmission unit specification): This works similar to the...

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Authors (1)

Jetty

Jetty

Sairam Jetty has more than 5 years of hands-on experience in many verticals of penetration testing, compliance, digital forensics, and malware research. He is currently working with Paladion Networks, Abu Dhabi, as a senior analyst and team lead. He has assisted and associated with various financial, telecom, and industrial institutions for testing and securing their applications and environments. Sairam has industry-standard certifications, such as OSCP, Digital Forensic Analyst, Digital Forensic Investigator, and Mobile Security Expert. He also specializes in source code review and mobile application security. He has acquired a great knowledge of SCADA/ICS and nuclear security from his corporate experience and self-learning.

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