Book Image

Network Scanning Cookbook

By : Sairam Jetty
Book Image

Network Scanning Cookbook

By: Sairam Jetty

Overview of this book

Network scanning is a discipline of network security that identifies active hosts on networks and determining whether there are any vulnerabilities that could be exploited. Nessus and Nmap are among the top tools that enable you to scan your network for vulnerabilities and open ports, which can be used as back doors into a network. Network Scanning Cookbook contains recipes for configuring these tools in your infrastructure that get you started with scanning ports, services, and devices in your network. As you progress through the chapters, you will learn how to carry out various key scanning tasks, such as firewall detection, OS detection, and access management, and will look at problems related to vulnerability scanning and exploitation in the network. The book also contains recipes for assessing remote services and the security risks that they bring to a network infrastructure. By the end of the book, you will be familiar with industry-grade tools for network scanning, and techniques for vulnerability scanning and network protection.
Table of Contents (10 chapters)

How to specify a target

The nmap command interprets any content appended without an associated switch as a target. The following is a basic syntax that specifies an IP address or a hostname to scan without any associated switches:

nmap localhost

The hostname is resolved with the configured DNS server and the IP address is obtained to perform the scan. If multiple IP address are associated with one hostname, the first IP address will be scanned and the result will be displayed. The following syntax allows nmap to perform scans on all the IP addresses resolved with the hostname provided in the command:


Nmap also supports scanning the whole subnet, provided that you append the mask at the end of an IP address or hostname. Then, Nmap will consider all the resolved IP addresses in the range of the mask mentioned. For example, would scan the...