Book Image

Learning Network Forensics

By : Samir Datt
Book Image

Learning Network Forensics

By: Samir Datt

Overview of this book

We live in a highly networked world. Every digital device—phone, tablet, or computer is connected to each other, in one way or another. In this new age of connected networks, there is network crime. Network forensics is the brave new frontier of digital investigation and information security professionals to extend their abilities to catch miscreants on the network. The book starts with an introduction to the world of network forensics and investigations. You will begin by getting an understanding of how to gather both physical and virtual evidence, intercepting and analyzing network data, wireless data packets, investigating intrusions, and so on. You will further explore the technology, tools, and investigating methods using malware forensics, network tunneling, and behaviors. By the end of the book, you will gain a complete understanding of how to successfully close a case.
Table of Contents (17 chapters)
Learning Network Forensics
About the Author
About the Reviewers

Making firewalls talk

Simply the name, firewall, conjures up an image of a great wall of fire burning anything that is unauthorized and trying to pass through.

Just as the name suggests, in the digital world, a firewall prevents an unauthorized access to or from a network. A firewall is usually at the perimeter of a private network and the open Internet, it acts as a barrier and allows traffic through based on a set of pre-defined rules:

The preceding image clearly demonstrates the functioning of a firewall. As we can see, the network traffic can either pass through or be rejected by the firewall when found to be contrary to a pre-defined rule. The key factor of interest for us is the fact that every interaction with the firewall leaves a trace. This is reflected in the form of an entry in the firewall logs. Network forensic investigations require us to understand the firewalls and events that produce the entries in the log files. As the Digital 007s, it's our job to "make the firewalls talk...