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{{Admon/caution|DO NOT USE THIS VERSION OF THE COURSE. This page will no longer be updated.|'''Debian version here:''' https://seneca-ictoer.github.io/OPS245
<br>'''CentOS version here:''' https://seneca-ictoer.github.io/OPS245-C7<br>'''Andrew's version here:''' http://wiki.littlesvr.ca/wiki/OPS245_Lab_6}}
=LAB PREPARATION=
[[Image:my-network.png|thumb|right|350px|Setting up networks is an essential operation for a system administrator. Maintaining network connectivity and securing the network are also essential operations. In this lab, we will '''configure a private virtual network using static IP addresses''' (eg. wired workstation connections). We will learn how to setup a DHCP network (eg. for notebook, table and smartphones) in lab 8.]]
# Use '''local hostname resolution''' to resolve simple server names with their corresponding IP Addresses
# Use common networking utilities to associate network services with port numbers for troubleshooting purposes
<!-- # Use '''shell scripts with arrays''' to store network configuration data-->
# Proceed with changes, and click '''Finish'''.
<ol>
<li value="1314">We will now reconfigure each of our VMs to use our new virtual network '''network1'''
<ol type="a">
<li value="1">Let's start with our '''centos1 VM'''. Double-click on your '''centos1''' VM, but instead of running the VM, click on the '''view''' menu, and select: '''Details'''<br />(Note: the Virtual Machine window will appear - do not start virtual machine)</li>
#: IP Address: '''192.168.245.11'''
#: Subnet Mask: '''255.255.255.0'''
#: Default Gateway: The IP address of '''virbr1''' on your centos host(c7host).
# Click on the '''DNS''' field and add The IP address (''virbr1''' on your centos host) as the primary DNS server.
# When finished, check your settings, and then click the '''Apply''' button.
[[Image:network-scripts.png|thumb|right|250px|Although you can use the '''ifconfig''' command to temporarily create a static IP address connection to a network, you need to add the network settings in the '''/etc/sysconfig/network-scripts''' directory to automatically connect to the network upon Linux system boot-up.]]
=== Part 3: Configuring VM Network Setup via Command Line ('''centos3centos2''' and '''centos2centos3''') ===
The centos2 and centos3 and centos2 VMs are '''text-based only''' systems, thus we cannot use a graphical tool to configure centos3 to connect to our private network. Therefore we will learn how to perform this task by using command-line tools.
:'''Perform the following steps:'''
<!-- ===Part 3: Using Arrays to Collect VM Network Information===
{|width="40%" align="right" cellpadding="10"
|- valign="top"
+<br>
<br>
sudo -u $SUDO_USER /bin/firefox /tmp/network-info.$$.html<br>
<br>
</code>
<br><br>
<ol><li value="7">Give this shell script execute permissions and run this shell script.</li><li>Run the shell script. What do you notice from the report that the shell script generated?</li><li>Then use wget command to download another variation of the network-info.bash shell script using the awk command to separate the variables and values into separate columns:<br><b><code><span style="color:#3366CC;font-size:1.2em;">https://ict.senecacollege.ca/~ops235peter.callaghan/ops245/labs/network-info-2.bash</span></code></b><br></li></ol>
-->
=INVESTIGATION 3: USING PYTHON TO MODIFY FILES=
In this investigation you will write a python script that will allow a user to interactively configure a network interface's configuration file. Before beginning, '''make a backup of your ifcfg files'''. '''Store the python script in ~/bin/''' on c7host.
Write a script called '''netconfig.py''' that will prompt the user for the following values, and write their answers into an ifcfg file stored in the '''/etc/sysconfig/network-scripts''' directory.
# Switch to your '''c7host''' VM.
# Change to your user's '''bin''' directory.
# Issue the Linux command: <b><code><span style="color:#3366CC;font-size:1.2em;">wget https://ictraw.senecacollegegithubusercontent.cacom/~peter.callaghanOPS245/ops245labs/labsmain/lab6-check.bash</span></code></b>
# Give the '''lab6-check.bash''' file execute permissions (for the file owner).
# Run the shell script and if there are any warnings, make fixes and re-run shell script until you receive "congratulations" message.
#Arrange proof of the following on the screen:<br><blockquote><span style="color:green;font-size:1.5em;">✓</span> '''centos2''' VM:<blockquote><ul><li>'''ssh''' from '''centos2''' to '''c7host''' VM.</li></ul></blockquote><span style="color:green;font-size:1.5em;">✓</span>'''c7host''' machine<blockquote><ul><li>Output from running the '''network-info.bash''' shell script</li><li>Run the '''lab6-check.bash''' script in front of your instructor (must have all <b><code><span style="color:#66cc00;border:thin solid black;font-size:1.2em;"> OK </span></code></b> messages)</li></ul></blockquote><span style="color:green;font-size:1.5em;">✓</span> '''Lab6''' log-book filled out.#Upload a screen of the proof from the previous step, along with the file generated by '''lab6-check.bash''', your log book, and your '''netconfig.py''' script to blackboard.
= Practice For Quizzes, Tests, Midterm & Final Exam =
# What is a port?
# What command will set your IP configuration to 192.168.55.22/255.255.255.0 24 ?
# What is the difference between UDP and TCP?
# What port number is used for DHCP servers?