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# Gain initial exposure to the '''iptables''' command used to configure and maintain a firewall for protection and troubleshooting
# Configure '''iptables''' to '''allow/disallow/forward''' different types of network traffic
== Investigation 1 ==
For the remainder of this course, we will focus on networking involving our VMs and our c7host machine. This lab will focus on setting up a virtual private network ('''VPN'''), connecting our VMs and c7host machine to the VPN, and configuring our VPN to make more convenient to use, troubleshoot and protect. '''Lab 7''' will focus more on configuring SSH and making access to the VPN more secure. Finally, '''lab 8''' will focus on configuring the network for fixed workstations, mobile devices, or both at the same time.
There are several reasons for creating '''VPNs'''. The main reason is to '''safely connect servers together''' (i.e. to safely limit but allow share information among computer network users). This allows for a secure connection of computers yet controlling access to and monitoring (protecting) access to permitted users (discussed in more depth in lab7).
<u>Configuring a Private Network (Via Virtual Machine Manager)</u>
[[Image:network-config-centos.png|thumb|600px|right|This diagram shows the current network configuration of your '''c7host''' machine in relation to your '''Virtual Machines'''. In this section, you will be learning to change the default network settings for both your '''c7host''' machine and '''VMs''' to belong to a '''virtual network''' using fixed IP Addresses. ]]
If we are going to setup a private network, we must do 2 major operations: First, '''define a new private network in the Virtual Manager application'''; and second, '''configure each of our VMs to connect to this new private network'''. In Part 1, we will be perform the first operation. In parts 2, 3, and 4, we will be performing the second operation for all VMS (graphical and command-line).