Book Image

Network Protocols for Security Professionals

By : Yoram Orzach, Deepanshu Khanna
5 (1)
Book Image

Network Protocols for Security Professionals

5 (1)
By: Yoram Orzach, Deepanshu Khanna

Overview of this book

With the increased demand for computer systems and the ever-evolving internet, network security now plays an even bigger role in securing IT infrastructures against attacks. Equipped with the knowledge of how to find vulnerabilities and infiltrate organizations through their networks, you’ll be able to think like a hacker and safeguard your organization’s network and networking devices. Network Protocols for Security Professionals will show you how. This comprehensive guide gradually increases in complexity, taking you from the basics to advanced concepts. Starting with the structure of data network protocols, devices, and breaches, you’ll become familiar with attacking tools and scripts that take advantage of these breaches. Once you’ve covered the basics, you’ll learn about attacks that target networks and network devices. Your learning journey will get more exciting as you perform eavesdropping, learn data analysis, and use behavior analysis for network forensics. As you progress, you’ll develop a thorough understanding of network protocols and how to use methods and tools you learned in the previous parts to attack and protect these protocols. By the end of this network security book, you’ll be well versed in network protocol security and security countermeasures to protect network protocols.
Table of Contents (23 chapters)
1
Part 1: Protecting the Network – Technologies, Protocols, Vulnerabilities, and Tools
7
Part 2: Network, Network Devices, and Traffic Analysis-Based Attacks
12
Part 3: Network Protocols – How to Attack and How to Protect

Advanced packet dissection with LUA

Now, before moving on to packet dissection, let’s first understand it.

Packet dissection means analyzing a specific part of a data packet, such as TCP or IPv4, that contains multiple dissectors. These are written in old-school C language.

Dissector is simply a protocol parser that helps a lot while troubleshooting network-level packets, especially when all the data is in TCP and it is hard to understand application-level traffic.

So, till now, we have seen packets in readable formats to analyze packet formats, but there is some raw data available that depicts some text-level decryption says data of the application logs, and from there to understand what sort of packet that it is? Or what if we have to introduce a new protocol packet for easy analysis, such as an ECHO packet?

This is where packet dissection comes in very handy to analyze packets at the core level. The following diagram represents packet dissection in simple terms...