Book Image

Mastering Linux Network Administration

By : Jay LaCroix
Book Image

Mastering Linux Network Administration

By: Jay LaCroix

Overview of this book

Linux is everywhere. Whether you run a home office, a small business, or manage enterprise systems, Linux can empower your network to perform at its very best. Armed with the advanced tools and best practice guidance of this practical guide, you'll be able to mold Linux networks to your will, empowering your systems and their users to take advantage of all that Linux-based networks have to offer. Understand how Linux networks function and get to grips with essential tips and tricks to manage them - whether you're already managing a networks, or even just starting out. With Debian and CentOS as its source, this book will divulge all the details you need to manage a real Linux-based network. With detailed activities and instructions based on real-world scenarios, this book will be your guide to the exciting world of Linux networking.
Table of Contents (17 chapters)
Mastering Linux Network Administration
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Installing and configuring OpenSSH


OpenSSH comes in two pieces, the client application and the server application. It's likely that the client application is installed by default in your distribution. The client allows you to connect to other nodes via SSH, but having the client alone doesn't allow others to connect to you. If you want to access a machine via SSH, that machine must also have the SSH server application installed. Your chosen distribution may have the server application installed by default, but most don't. This is due to security—unless you absolutely need to have an application running and listening for connections, it should be absent. The fewer applications, the smaller the attack surface someone could use against you.

In Debian, SSH server is an option during the installation process. If selected, the server application of SSH will be present and will start by default. To check whether the SSH server package is installed on a Debian system, execute the following command...