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You're reading from  Nmap Network Exploration and Security Auditing Cookbook, Third Edition - Third Edition

Product typeBook
Published inSep 2021
PublisherPackt
ISBN-139781838649357
Edition3rd Edition
Tools
Nmap
Concepts
Network Security
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Author (1)
Paulino Calderon
Paulino Calderon
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Paulino Calderon

Paulino Calderon (@calderpwn on Twitter) is the cofounder of Websec, a company offering information security consulting services based in Mexico and Canada. When he is not traveling to a security conference or conducting on-site consulting for Fortune 500 companies, he spends peaceful days in Cozumel, a beautiful small island in the Caribbean, learning new technologies, conducting big data experiments, developing new tools, and finding bugs in software. Paulino is active in the open source community, and his contributions are used by millions of people in the information security industry. In 2011, Paulino joined the Nmap team during the Google Summer of Code to work on the project as an NSE developer. He focused on improving the web scanning capabilities of Nmap, and he has kept contributing to the project since then. In addition, he has been a mentor for students who focused on vulnerability detection during the Google Summer of Code 2015 and 2017. He has published Nmap 6: Network Exploration and Security Auditing Cookbook and Mastering the Nmap Scripting Engine, which cover practical tasks with Nmap and NSE development in depth. He loves attending information security conferences, and he has given talks and participated in workshops in dozens of events in Canada, the United States, Mexico, Colombia, Peru, Bolivia, and Curacao.
Read more about Paulino Calderon

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Discovering hosts with TCP ACK ping scans

Similar to the TCP SYN ping scan, the TCP ACK ping scan determines whether a host is responding. It can be used to detect hosts blocking SYN packets and ICMP echo requests, but this technique will most likely be blocked by modern firewalls that track connection states because it sends bogus TCP ACK packets associated with non-existing connections.

This recipe shows how to perform a TCP ACK ping scan and its related options.

How to do it...

Open your terminal and enter the following command:

# nmap -sn -PA <target>

The result is a list of hosts that responded to the TCP ACK packets sent and, therefore, are online:

# nmap -sn -PA 192.168.0.1/24
Nmap scan report for 192.168.0.1 Host is up (0.060s latency).
Nmap scan report for 192.168.0.60 Host is up (0.00014s latency).
Nmap done: 256 IP addresses (2 hosts up) scanned in 6.11 seconds

How it works...

The -sn option tells Nmap to skip the port scan phase and only perform...

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Nmap Network Exploration and Security Auditing Cookbook, Third Edition - Third Edition
Published in: Sep 2021Publisher: PacktISBN-13: 9781838649357
© 2021 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Paulino Calderon

Paulino Calderon (@calderpwn on Twitter) is the cofounder of Websec, a company offering information security consulting services based in Mexico and Canada. When he is not traveling to a security conference or conducting on-site consulting for Fortune 500 companies, he spends peaceful days in Cozumel, a beautiful small island in the Caribbean, learning new technologies, conducting big data experiments, developing new tools, and finding bugs in software. Paulino is active in the open source community, and his contributions are used by millions of people in the information security industry. In 2011, Paulino joined the Nmap team during the Google Summer of Code to work on the project as an NSE developer. He focused on improving the web scanning capabilities of Nmap, and he has kept contributing to the project since then. In addition, he has been a mentor for students who focused on vulnerability detection during the Google Summer of Code 2015 and 2017. He has published Nmap 6: Network Exploration and Security Auditing Cookbook and Mastering the Nmap Scripting Engine, which cover practical tasks with Nmap and NSE development in depth. He loves attending information security conferences, and he has given talks and participated in workshops in dozens of events in Canada, the United States, Mexico, Colombia, Peru, Bolivia, and Curacao.
Read more about Paulino Calderon

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