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DHCP Client on Cisco IOS

DHCP server is often used on Cisco IOS routers so you supply hosts with an IP address. We can also use DHCP client on our routers which is useful if your ISP uses dynamic IP addresses for customers.

In this lesson, we’ll take a look how to configure your router as DHCP client.

Configuration

This is the topology we will use:

Let’s start with the DHCP server.

DHCP Server

Let’s create a pool for our local subnet and include a default route:

Server(config)#ip dhcp pool MY_POOL
Server(dhcp-config)#network 192.168.1.0 /24
Server(dhcp-config)#default-router 192.168.1.254

That’s all we need, let’s look at the DHCP client now.

DHCP Client

You only need one command on the interface to use DHCP:

Client(config)#interface FastEthernet 0/0
Client(config-if)#ip address dhcp
Client(config-if)#no shutdown

After a few seconds you will see this:

Client#
%DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0/0 assigned DHCP address 192.168.1.1, mask 255.255.255.0, hostname Client

Great so we got an IP address:

Client#show ip interface brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            192.168.1.1     YES DHCP   up                    up

The router also installs a default route:

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DHCP Static Binding on Cisco IOS

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Cisco IOS DHCP Client Identifier

Tags: DHCP, Network Services

Forum Replies

kayoumt says:

The IOS I’m using in GNS3 does have the ip dhcp pool command. It unfortunately does not have the ip address dhcp command.

It is probably a too old IOS ?
lagapides says:

Hello Maodo

Hmmm that’s interesting. According to Cisco, the ip address dhcp command was added to the 12.1(2)T version of IOS. What IOS version are you using?

Laz
sales2161 says:

Hello Laz,

I will have to add my 2 cents on this. I work with different Cisco devices everyday and sometime I will be supporting a supervisor linecard which doesn’t have ip add dhcp command feature on it regardless of their version. Also some cisco ASA don’t have this command
mrayubzada says:

Hi Lazaros,
Does client act as a host computer or as a router?
hroger says:

try the CCENT tomorrow morning and I made the test that you propose.

at question 45, I had the choice between
ip dhcp MYPOOL pool
network 192.168.1.1 255.255.255.0

and
ip dhcp MYPOOL pool
network 192.168.1.0 / 24

as all IOS accept “network subnet subnet-mask” and only some recent bones accept “network subnet prefix-length”, I chose “network 192.168.1.1 255.255.255.0”
but the answer of your test indicates as good answer “network 192.168.1.0 / 24”, alas!

however, in packet tracer, “network 192.168.1.1 255.255.255.0” neither “network 192.168.1.10 255.255.255.0” no
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