May 2018
Intermediate to advanced
326 pages
8h 32m
English
Content preview from Practical Network Scanning
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Operating system detection
OS detection is valuable information about a targeted host on what OS is currently installed and running. Let's discuss the logic behind discovery and how Nmap guesses the operating system.
Nmap decodes attributes and patterns of response of standard probes, and sends it to a remote host to determine the operating system. This process is named TCP/IP fingerprinting. In the following output, you can see a number of services running on targeted host IP 23.100.21.174. Folllowing is my Linux box. For testing purposes, I installed Apache2 web server. In the following screenshot, we can see that the default page appears when the browser is launched:
The best guess by Nmap (aggressive OS guess) is that there is an 86% ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.