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Nmap: Network Exploration and Security Auditing Cookbook

You're reading from   Nmap: Network Exploration and Security Auditing Cookbook Network discovery and security scanning at your fingertips

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Product type Paperback
Published in May 2017
Publisher
ISBN-13 9781786467454
Length 416 pages
Edition 2nd Edition
Languages
Tools
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Author (1):
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Paulino Calderon Paulino Calderon
Author Profile Icon Paulino Calderon
Paulino Calderon
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Table of Contents (18) Chapters Close

Preface 1. Nmap Fundamentals FREE CHAPTER 2. Network Exploration 3. Reconnaissance Tasks 4. Scanning Web Servers 5. Scanning Databases 6. Scanning Mail Servers 7. Scanning Windows Systems 8. Scanning ICS SCADA Systems 9. Optimizing Scans 10. Generating Scan Reports 11. Writing Your Own NSE Scripts 12. HTTP, HTTP Pipelining, and Web Crawling Configuration Options 13. Brute Force Password Auditing Options 14. NSE Debugging 15. Additional Output Options 16. Introduction to Lua 17. References and Additional Reading

Discovering hosts with TCP SYN ping scans

Ping scans are used for detecting live hosts in networks. Nmap's default ping scan (-sP) sends TCP SYN, TCP ACK, and ICMP packets to determine if a host is responding, but if a firewall is blocking these requests, it will be treated as offline. Fortunately, Nmap supports a scanning technique named the TCP SYN ping scan that is very handy to probe different ports in an attempt to determine if a host is online or at least has more permissive filtering rules.

This recipe will talk about the TCP SYN ping scan and its related options.

How to do it...

Open your terminal and enter the following command:

# nmap -sn -PS <target>  

You should see the list of hosts found in the target range using TCP SYN ping scanning:

...
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