Book Image

Linux for Networking Professionals

By : Rob VandenBrink
1 (1)
Book Image

Linux for Networking Professionals

1 (1)
By: Rob VandenBrink

Overview of this book

As Linux continues to gain prominence, there has been a rise in network services being deployed on Linux for cost and flexibility reasons. If you are a networking professional or an infrastructure engineer involved with networks, extensive knowledge of Linux networking is a must. This book will guide you in building a strong foundation of Linux networking concepts. The book begins by covering various major distributions, how to pick the right distro, and basic Linux network configurations. You'll then move on to Linux network diagnostics, setting up a Linux firewall, and using Linux as a host for network services. You'll discover a wide range of network services, why they're important, and how to configure them in an enterprise environment. Finally, as you work with the example builds in this Linux book, you'll learn to configure various services to defend against common attacks. As you advance to the final chapters, you’ll be well on your way towards building the underpinnings for an all-Linux datacenter. By the end of this book, you'll be able to not only configure common Linux network services confidently, but also use tried-and-tested methodologies for future Linux installations.
Table of Contents (20 chapters)
1
Section 1: Linux Basics
4
Section 2: Linux as a Network Node and Troubleshooting Platform
8
Section 3: Linux Network Services

Chapter 3 – Using Linux and Linux Tools for Network Diagnostics

  1. You will never see this. From the network perspective, sessions, connections, and conversations only exist for the TCP protocol (at OSI Layer 5). UDP conversations are stateless – the network does not have a way to relate a UDP request to a UDP response – this all has to happen within the application. Often the application will include something like a session number or sequence number (or both, depending on the application) in the packet data to accomplish this. Keep in mind though that if the application does maintain a session over UDP somehow, it's the application's responsibility to keep it straight – there's nothing on the host or network at Layer 5 that will track this as we see in TCP.
  2. If you are troubleshooting network or application issues, this is critical information. If, for instance, you have an application issue that may be network related, understanding...