Book Image

Nmap 6: Network Exploration and Security Auditing Cookbook

Book Image

Nmap 6: Network Exploration and Security Auditing Cookbook

Overview of this book

Nmap is a well known security tool used by penetration testers and system administrators. The Nmap Scripting Engine (NSE) has added the possibility to perform additional tasks using the collected host information. Tasks like advanced fingerprinting and service discovery, information gathering, and detection of security vulnerabilities."Nmap 6: Network exploration and security auditing cookbook" will help you master Nmap and its scripting engine. You will learn how to use this tool to do a wide variety of practical tasks for pentesting and network monitoring. Finally, after harvesting the power of NSE, you will also learn how to write your own NSE scripts."Nmap 6: Network exploration and security auditing cookbook" is a book full of practical knowledge for every security consultant, administrator or enthusiast looking to master Nmap. The book overviews the most important port scanning and host discovery techniques supported by Nmap. You will learn how to detect mis-configurations in web, mail and database servers and also how to implement your own monitoring system. The book also covers tasks for reporting, scanning numerous hosts, vulnerability detection and exploitation, and its strongest aspect; information gathering.
Table of Contents (18 chapters)
Nmap 6: Network Exploration and Security Auditing Cookbook
Credits
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
References
Index

Discovering hosts with UDP ping scans


Ping scans are used to determine if a host is responding and can be considered online. UDP ping scans have the advantage of being capable of detecting systems behind firewalls with strict TCP filtering leaving the UDP traffic forgotten.

This next recipe describes how to perform a UDP ping scan with Nmap and its related options.

How to do it...

Open a terminal and type the following command:

# nmap -sP -PU <target>

Nmap will determine if <target> is reachable by using this technique.

# nmap -sP -PU scanme.nmap.org 


Nmap scan report for scanme.nmap.org (74.207.244.221) 
Host is up (0.089s latency). 
Nmap done: 1 IP address (1 host up) scanned in 13.25 seconds 

How it works...

The technique used by a UDP ping scan works as follows:

  • Nmap sends an empty UDP packet to ports 31 and 338

  • If the host is responding, it should return an ICMP port unreachable error

  • If the host is offline, various ICMP error messages could be returned

There's more...

Services...