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Practical Network Scanning

You're reading from Practical Network Scanning Capture network vulnerabilities using standard tools such as Nmap and Nessus

Product type Paperback

Published in May 2018

Publisher

ISBN-13 9781788839235

Length 326 pages

Edition 1st Edition

Languages

SQL

Tools

Nessus

Concepts

Network Security

Author (1):

Ajay Singh Chauhan

View More author details

Table of Contents (15) Chapters

Preface

1. Fundamental Security Concepts FREE CHAPTER

2. Secure Network Design

3. Server-Level Security

4. Cloud Security Design

5. Application Security Design

6. Threat Detection and Response

7. Vulnerability Assessment

8. Remote OS Detection

9. Public Key Infrastructure-SSL

10. Firewall Placement and Detection Techniques

11. VPN and WAN Encryption

12. Summary and Scope of Security Technologies

13. Assessment

14. Other Books you may enjoy

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TCP/IP fingerprinting methods supported by Nmap

In the past, the banner grabbing method was used to detect remote operating systems. Telnet Connect used to be sent to a targeted system and the system would display a banner of the operating system running on a host. This was not a very accurate method as the system admin could also disable a banner or change the actual banner in order to misguide attackers.

The new method of remote OS detection is to analyze the packet between the source and destination. This detection technique detects OS platforms and OS versions as well.

TCP/UDP/IP basic

To use an analogy, if IPs are a building address, service ports are flat numbers. Both TCP and UDP uses incoming and outgoing ports for data communication. Most IP-based services use standard ports (HTTP TCP:80, SMTP TCP:25, and DNS TCP-UDP:53).

TCP stack has six flag message types to complete a three-way handshake:

Here is a packet capture for one of the websites I opened on the web browser. This shows a...

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Authors (1)

Singh Chauhan

Singh Chauhan

Ajay Singh Chauhan is an experienced Network and Security Architect and has been working extensively in the IT industry for 15 years. During his career, he has had varied responsibilities, ranging from looking after an entire IT infrastructure to providing network operations, implementation, and network design solutions. Ajay works almost exclusively with large-scale cloud datacenter multi-vendor technologies. He contributes to the Cisco blogging platform by providing IT Professionals with troubleshooting tips and tricks.

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