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Linux Networking Cookbook

You're reading from Linux Networking Cookbook Over 40 recipes to help you set up and configure Linux networks

Product type Paperback

Published in Jun 2016

Publisher

ISBN-13 9781785287916

Length 152 pages

Edition 1st Edition

Tools

Ubuntu Server

Concepts

Networking

Authors (2):

Dsouza

Gregory Boyce

View More author details

Table of Contents (14) Chapters

Preface

1. Configuring a Router

2. Configuring DNS FREE CHAPTER

3. Configuring IPv6

4. Remote Access

5. Web Servers

6. Directory Services

7. Setting up File Storage

8. Setting up E-mail

9. Configuring XMPP

10. Monitoring Your Network

11. Mapping Your Network

12. Watching Your Network

Index

Identifying operating systems

In addition to identifying services running on servers, nmap can additionally attempt to identify the Operating System running on a particular system. This type of scan typically requires at least one open and one closed port to be reached.

How to do it...

Use nmap –O to do OS fingerprinting:

$ sudo nmap -n -O 192.168.1.205 -p 22,80
Starting Nmap 6.40 ( http://nmap.org ) at 2016-05-20 17:57 EDT
Nmap scan report for 192.168.1.205
Host is up (0.013s latency).
PORT   STATE  SERVICE
22/tcp closed ssh
80/tcp open   http
MAC Address: 74:DA:EA:F3:FF:07 (Unknown)
Device type: general purpose
Running: Linux 2.6.X|3.X
OS CPE: cpe:/o:linux:linux_kernel:2.6 cpe:/o:linux:linux_kernel:3
OS details: Linux 2.6.32 - 3.2
Network Distance: 1 hop

OS detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 2.63 seconds

How it works…

Nmap's OS detection code works by issuing various packet types to services...

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83

Tech Concepts

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Programming languages

73

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Authors (2)

Dsouza

Dsouza

See other products by Dsouza

Gregory Boyce

Gregory Boyce

Gregory Boyce is a technologist with nearly 20 years' experience using and managing Linux systems. When he's not at work or spending time with his wife and two daughters, he plays around with new technologies. Gregory has spent the last 15 years working at Akamai Technologies, where he has worked in roles ranging from Network Operations, Internal IT, Information Security, Software Testing, and Professional Services. Currently, he heads up the Linux OS team that manages Akamai's custom Linux operating system, which runs on their massively distributed customer-facing network.

See other products by Gregory Boyce

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