DHCP on packet tracer

This tutorial is about how to configure dhcp on cisco router in packet tracer. The Dynamic Host Configuration Protocol (DHCP) is a network protocol that is used to configure network devices. DHCP allows a computer to join an IP-based network without having a pre-configured IP address. DHCP is a protocol that assigns unique IP addresses to devices, then releases and renews these addresses as devices leave and re-join the network. 
Internet Service Providers (ISPs) usually use DHCP to allow customers to join the Internet with minimum effort. The DHCP server maintains a database of available IP addresses and configuration information. When it receives a request from a client, the DHCP server determines the network to which the DHCP client is connected, and then allocates an IP address. DHCP servers typically grant IP addresses to clients only for a limited interval.

Lets apply DHCP on packet tracer.

First, let us make a topology with one router on which we will apply DHCP and several client PCs. More like this one,

Now, we will apply DHCP on the router.

The commands in sequence are as follows.

In the following command “ip dhcp pool cisco”, we are creating a  pool for DHCP called cisco. cisco is the name here and we can name it whatever we want.

Similarly, in the command “default-router “ we are telling the DHCP about the default route to follow.

Notice, after we exit from DHCP mode, we are excluding some IP addresses by applying this command “ip dhcp excluded-addresses x-x”, where x is the starting and ending IP address respectively. We are basically reserving some IPs for our use. It can be used to attach printers, or assign it to some specific users for security purposes. You can also give dns address in dhcp by using the following command.
dns-server 192.168.1.15.

Now, open the PC.

Click on IP Configuration

Select from Static to DHCP

And after DHCP request is completed you will see the following screen.

Now, after applying some IPs in sequence, DHCP will skip the IPs that we have excluded from our DHCP pool.

That is all, we have applied DHCP on packet tracer.

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