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# Use your '''centos3centos2''' and '''centos4''' VMs for this section.
# On your '''centos4''' terminal window (via ssh from your c7hsot machine) make sure that the command<br><b>tail -f /var/log/messages</b> is running.
# On your '''centos3centos2''' VM, change the configuration of '''eth0''' (or your interface name) to receive dynamic address configuration (i.e. via graphical application, for IVP4 tab, change ''Address'' from '''Manual''' to '''DHCP''', and '''Apply''' settings)<br>([http://zenit.senecac.on.ca/wiki/index.php/OPS235_Lab_6_-_CentOS7#Part_2:_Configuring_VM_Network_Setup_Graphically_.28system-config-network.29 Refer to Lab6, Investigation1, Part2]).<br><br>Note: if you are configuring via command line, make certain to restart the network for centos3centos2.# Logout and restart your '''centos3centos2''' VM.# Observe the messages that get logged from the tail -f command as your centos3 centos2 VM starts. You should see output similar to the following:<br><br>
::<span style="font-family:courier;">Mar 24 13:28:24 centos4 dhcpd: DHCPDISCOVER from 52:54:00:61:00:e7 via eth2</span>
::<span style="font-family:courier;">Mar 24 13:28:25 centos4 dhcpd: DHCPOFFER on 192.168.235.51 to 52:54:00:61:00:e7 via eth2</span>
::<span style="font-family:courier;">Mar 24 13:28:25 centos4 dhcpd: DHCPACK on 192.168.235.51 to 52:54:00:61:00:e7 via eth2<br><br></span>
<ol>
<li value="6">On '''centos3centos2''', confirm the IP address assignment using <b><code><span style="color:#3366CC;font-size:1.2em;">ifconfig</span></code></b></li>
<li>Has the IP Address changed? If so, how has the IP Address been assigned according to the '''dhcpd.conf''' file settings?</li>
</ol>
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# Remain in your '''centos3centos2''' and '''centos4''' VMs for this section.# If your '''centos4''' DHCP server successfully issued the proper IP address configuration values to '''centos3centos2''', check the file called:<br>'''/var/lib/dhcpd/dhcpd.leases''' in your <u>'''centos4''' VM</u>. You should the similar contents:<br><br>
::<span style="font-family:courier;"> lease 192.168.235.51 {</span>
::<span style="font-family:courier;"> starts 5 2015/07/10 17:57:34;</span>
::<span style="font-family:courier;"> rewind binding state free;</span>
::<span style="font-family:courier;"> hardware ethernet 52:54:00:0e:7d:a4;</span>
::<span style="font-family:courier;"> client-hostname "centos3centos2";</span>
::<span style="font-family:courier;"> }</span>
<ol><li value="3">On the client '''centos3centos2''' check the contents of the <b>/var/lib/dhclient</b> directory. The files in this directory is where the dhclient stores its record of leases.<br><br> '''NOTE:''' If there are no files, then in a shell as root in your centos3 centos2 VM issue the command: <b><code><span style="color:#3366CC;font-size:1.2em;">dhclient eth0</span></code></b><br>Then check to see if there is file containing lease information in that directory.<br><br></li>
</ol>
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# Remain in your '''centos3centos2''' and '''cento3''' VMs for this section.
# Make certain that you are located in your '''centos4''' virtual machine.
# Create a host declaration for '''centos3centos2'''. Make sure you record the correct <code>hardware ethernet</code> setting that corresponds to the MAC address of the interface in '''centos3centos2'''.
# Give it the fixed-address '''192.168.235.42'''<br><br>'''Note:''' When supplying fixed-address it is important that the address assigned is exclusive of any ranges that have been declared. Otherwise it may be possible for 2 different hosts to receive the same address.<br><br>
<ol><li value="5">Start your service and test the address assignment by releasing your current address on '''centos3centos2''' and then requesting a new address. Use the following commands on '''centos3centos2''':</li>
</ol>
::: <b><code><span style="color:#3366CC;font-size:1.2em;">ifdown eth1</span></code></b>
# Give the '''lab8-check.bash''' file execute permissions (for the file owner).
# Run the shell script and if 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> '''centos3centos2''' VM:<blockquote><ul><li>'''ifconfig eth0''' shows IP address '''192.168.235.42'''</li><li>DHCP client lease file</li></ul></blockquote><span style="color:green;font-size:1.5em;">✓</span> '''centos4''' VM:<blockquote><ul><li>DHCP server log file showing a lease occuring</li><li>DHCP server configuration file showing subnet and host declaration</li><li>DHCP server lease file</li></ul></blockquote><span style="color:green;font-size:1.5em;">✓</span> '''Lab8''' log-book filled out.
= Practice For Quizzes, Tests, Midterm & Final Exam =