DHCP Server in Packet Tracer

Remember how annoying it was to assign the IP addresses to all of the clients in Packet Tracer in the last lab...

In this lab, you will configure a DHCP Server in Packet Tracer to assign IP's to laptops and workstations.

Using your Packet Tracer file from the Lab Prep, do the following:

Find and review your Subnet Table from Last Week's Lab

VLAN	VLAN_NAME	Hosts Needed	Network Address	Netmask	Router Address	CIDR
200	StuWireless	900	10.22.0.0	255.255.252.0	10.22.0.1	/22
210	FSWireless	650	10.22.4.0	255.255.252.0	10.22.4.1	/22
110	Student	450	10.22.8.0	255.255.255.0	10.22.8.1	/24
1	Management	250	10.22.9.0	255.255.255.0	10.22.9.1	/24
100	FacStaff	200	10.22.10.0	255.255.255.0	10.22.10.1	/24
130	StuLab1	35	10.22.11.0	255.255.255.192	10.22.11.1	/26
140	StuLab2	35	10.22.11.64	255.255.255.192	10.22.11.65	/26

Configure the DHCP Server

Rename the generic server you enabled in the Lab Prep to DHCP-01

Go to the Services tab and enable DHCP

Change the Start Address of serverPool to 100 in the last octet.

• serverPool is the Default Pool and cannot be removed.
• You will use this pool for VLAN 1 Management

HIT SAVE

Create a Pool for each of your FacStaff, Student, Lab1, and Lab2 VLANs

• Default gateway is the router address for that VLAN (e.g. FacStaff, Student...)
• Leave DNS at 0.0.0.0
• Start IP address -the first IP that you want to assign (I suggest starting at 20,50, or 100)
• Subnet Mask for that VLAN- get this correct!
• Maximum Users - set this close to the requirements in your Subnet Table
• TFTP leave at 0.0.0.0

FacStaff

Default G: 10.22.10.1

DNS: 0.0.0.0

Start IP: 10.22.10.20

Sub Mask: 255.255.255.0

Max User: 200

TFTP: 0.0.0.0

Student

Default G: 10.22.8.1

DNS: 0.0.0.0

Start IP: 10.22.8.50

Sub Mask: 255.255.255.0

Max User: 400

TFTP: 0.0.0.0

StuLab1

Default G: 10.22.11.1

DNS: 0.0.0.0

Start IP: 10.22.11.20

Sub Mask: 255.255.255.192

Max User: 30

TFTP: 0.0.0.0

StuLab2

Default G: 10.22.11.65

DNS: 0.0.0.0

Start IP: 10.22.11.70

Sub Mask: 255.255.255.192

Max User: 30

TFTP: 0.0.0.0

Test your DHCP Server

Add a workstation directly to East-Core-Switch on VLAN1 (use FA0/4 or other open interface)

Workstation should be able to get an IP address from the DHCP server (look at IP Configuration) -you can also try ipconfig /renew from the command line

Configure DHCP Relay

East-Core-Switch is the router for your VLANs. Remember - DHCP requests are broadcasts and cannot cross a router without help!

To get DHCP broadcasts from your user VLANs (100, 110, 130, 140), you need to tell the router to forward them to your DHCP server.

This is done with the "ip helper-address" vlan interface configuration

• On East-Core-Switch, go into the interface configuration for FacStaff VLAN 100 (config t, interface vlan 100)
• Use "ip helper-address" to provide the IP address of the DHCP server

DHCP IP: 10.22.9.2

• Repeat steps for each user vlan

Configure Clients to use DHCP

Go into the configuration on your Admin, Student, and Lab Workstations, Laptops and change the Gateway from static to DHCP

Your devices should get DHCP addresses

All of your systems should be able to ping each other.

TIP: Once turning on DCHP - Give It Time To Think!

When complete - submit your Packet Tracer file