=== Part 1: Enabling the sshd service. ===

# Launch ALL of your VMs.

# Switch to your '''centos3''' VM.<br><br>

The ssh client utility also contains many options to provide useful features or options when establishing secure connections between servers. One of these features is referred to as '''tunnelling''' - this term refers to running programs on remote servers (i.e. running the program on a remote server, yet interacting and viewing program on your local server. Since '''X-windows''' in Linux is a support <u>layer</u> to transmit graphical information efficiently between servers, ssh tunnelling becomes more useful and important to allow organizations to work efficiently and securely in a user-friendly environment.

# Switch to your '''centos1''' VM.

You can also use ssh to '''tunnel window and bitmap information''', allowing us to login to a remote desktop host and '''run a Xwindows application''' such as <b>gedit</b> or <b>firefox</b> and the application will run on the remote host but be displayed on the local host.

# For this section, you will be using your '''c7host''' and '''centos1''' VMs.

Sneaky! >;)

# For this section, you will still be using your '''c7host''' and '''centos1''' VMs.

The Linux system administrator can also '''configure the SSH server to make the SSH server more secure'''. Examples include not permitting root login, and change the default port number for ssh.

# For this section, you will still be using your '''c7host''' and '''centos1''' VMs.

{{Admon/important|Time for a new backup!|If you have successfully completed this lab, make a new backup of your virtual machines as well as your host machine.}}

# Make certain ALL of your VMs are running.

# Switch to your '''c7host''' VM and '''su -''' into root.