How to Configure DHCP on Cisco Router 871 or 18xx or 21xx or 26xx .(Series)

DHCP stands for Dynamic Host Configuration Protocol. Basically it’s a mechanism which assigns IP addresses to computers dynamically. Usually DHCP is a service running on a server machine in the network in order to assign dynamic IP addresses to hosts. All Cisco 800 series models have the ability to work as DHCP servers, thus assigning addresses to the internal LAN hosts. Without a DHCP server in the network, you would have to assign IP addresses manually to each host. These manually assigned addresses are also called “static IP addresses”.

In this post I will show you how to configure a Cisco 851 or 871 router to work as DHCP server. The same configuration applies for other 800 series models as well.

Router> enable

Router# config t

! define an IP address pool name and range

Router(config)# ip dhcp pool LANPOOL

! define a network range for the addresses that will be assigned

Router(dhcp-config)# network 192.168.1.0 255.255.255.0

! define a dns name to assign to clients

Router(dhcp-config)# domain-name xcessl0gycs.com

! define a default gateway for the clients

Router(dhcp-config)# default-router 192.168.1.1

! define the dns server for the clients

Router(dhcp-config)# dns-server 100.100.100.1

! define a WINS server if you have one

Router(dhcp-config)# netbios-name-server 192.168.1.2

Router(dhcp-config)# exit

!The following addresses will not be given out to clients

Router(config)# ip dhcp excluded-address 192.168.1.1 192.168.1.10

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Note: Now, Client will get 192.168.1.11-192.168.1.254 (Network Range Already Defined).

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