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How to Configure DHCP on Cisco 851 or 871 Router?

January 21 2013 , Written by Cisco & Cisco Router, Network Switch Published on #Cisco Routers

Basically DHCP is 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 we 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


! define a dns name to assign to clients
Router(dhcp-config)# domain-name mycompany.com


! define a default gateway for the clients
Router(dhcp-config)# default-router


! define the dns server for the clients
Router(dhcp-config)# dns-server


! define a WINS server if you have one
Router(dhcp-config)# netbios-name-server
Router(dhcp-config)# exit


!The following addresses will not be given out to clients
Router(config)# ip dhcp excluded-address

---Reference from networkstraining.com

More Related DHCP Guides:

How to Configure DHCP on a Cisco Router or Cisco Switch?

How to Configure VoIP on a Cisco 871 Router?

How to Configure DHCP Snooping in a Cisco Catalyst Switch?

How to Configure DHCP Snooping?

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