Skip to main content

Lab 04: DHCP

Some of the items in here involved editing my CentOS Reference page.​

Step 0: PuTTY​

(Installing PuTTY just involves downloading the .msi file from their website) (The only interesting part was using matt.compton-adm domain admin for the UAC prompt)

Step 1: Installing dhcp​

  • Run yum install dhcp - Installs the dhcp daemon that we configure

Step 2: Configure dhcpd​

  • Run either nano /etc/dhcp/dhcpd.conf as root, or prefix with sudo
  • Type in contents like the below: contents of dhcpd.conf

Step 3: Start & Enable dhcpd​

  • Run systemctl start dhcpd (prefix with sudo if you're not logged in as root)
    • This command starts dhcpd in the background as a daemon
  • Run systemctl enable dhcpd (again, prefix with sudo if needed.)
    • This command instructs the system to auto-start the service when the system boots.

Step 4: Allow dhcpd through firewall​

  • Run firewall-cmd --add-service=dhcp --permanent
    • The firewall's rule sets know that dhcp is UDP port 67, so we don't have to explicitly say it.
  • Run firewall-cmd --reload to make the change active.

Step 5: Reconfigure Workstation to use the new DHCP server​

Like in Lab 1, we're editing the adapter options. Only this time, we're setting both back to automatic

  • Control Panel -> Network and Internet -> Network Connections
  • Ethernet0 properties -> IPv4 Properties
  • Tick Obtain an IP address automatically
  • Tick Obtain DNS server address automatically

Deliverable 1​

Proving that DHCP works correctly with a screenshot of ipconfig /all results of ipconfig command

Deliverable 2​

Log entries on dhcp01-matt of the DHCP request from wks01-matt Command used: sudo cat /var/log/messages | grep wks01-matt results of command

Deliverable 3​

Wireshark outputs from DHCP transaction. wireshark capture

Deliverable 4​

To change the lease time, I consulted an online man page for dhcpd, and edited the file /etc/dhcp/dhcpd.conf

Contents of the file: updated configuration

Proof of updated lease time ipconfig new output