Basic DHCP Configuration

cybern4

September 28, 2016 | Views: 6853

Save

Begin Learning Cyber Security for FREE Now!

FREE REGISTRATION Already a Member Login Here

DHCP is the dominant way of providing end user devices with the information required to connect to your network.

In small or midsize environments DHCP is usually provided through the ISR Router.

Steps needed to deploy DHCP

Define which addresses are going to be excluded.
Statically configure addresses on Servers and to any device that needs a specific IP address.
Configure your Router as DHCP relay if a DHCP Server is used or enable the DHCP Service on your router to act as a DHCP Server.

Configuring a DHCP Relay Agent

In case your network has a dedicated platform that provides DHCP services , you should configure on the interface that is the default gateway the command : ip helper-address address

If your DHCP Server has the 192.168.33.1 address then you should type:

Router(config-if)# ip helper-address 192.168.33.1

Configuring a DHCP Server on a Cisco Router

Router(config)# ip dhcp excluded-address 10.1.1.1 10.1.1.9

// excludes the addresses 10.1.1.1 – 10.1.1.9 from being assigned to hosts.

Router(config)# ip dhcp pool DHCP1

// Creates a DHCP Pool named DHCP1

Router(dhcp-config)# network 10.1.1.0 255.255.255.0
// Defines the Network that is going to be used to provide addresses , here it will use the 10.1.1.0 /24 subnet .

Router(dhcp-config)#default-router 10.1.1.1
// The default gateway is 10.1.1.1

Router(dhcp-config)#dns-server 4.2.2.2
// DNS Server is 4.2.2.2

The previous commands have this effect:

addresses 10.1.1.1 – .9 are not assigned to hosts
The network range is 10.1.1.0 /24
The Gateway is 10.1.1.1
DNS server is 4.2.2.2

Caution : In order for the DHCP Service to operate you should have configured the interface with an address from the 10.1.1.0 /24 subnet usually the default gateway address 10.1.1.1 /24

Share with Friends

Use Cybytes and
Tip the Author!

Join

Share with Friends

Ready to share your knowledge and expertise?

Submit to 0P3N

10 Comments

santoshnibde
1:54 am on March 28, 2017

Nice

Log in to Reply
tappetmus
2:57 am on November 3, 2016

nice info

Log in to Reply
batsleuth
3:14 pm on October 9, 2016

nice article. very straight forward

Log in to Reply
dmnick691
11:28 am on October 6, 2016

This is great. I used to configure dhcp all the time, but my role has changed in the past few years so it’s always great to see post like this. It is good and straight forward.

Log in to Reply
daisy101
8:10 am on October 5, 2016

Thank you !

Log in to Reply

Page 2 of 2«12

Comment on This

You must be logged in to post a comment.

Our Revolution

We believe Cyber Security training should be free, for everyone, FOREVER. Everyone, everywhere, deserves the OPPORTUNITY to learn, begin and grow a career in this fascinating field. Therefore, Cybrary is a free community where people, companies and training come together to give everyone the ability to collaborate in an open source way that is revolutionizing the cyber security educational experience.