How to Configure a DHCP Server on Cisco 1841 Series

The 1841 Integrated Services Router is a network appliance created by Cisco. Cisco 1841 offers high-performance, enterprise-class routing with some additional features such as
hardware-based encryption and virtual network acceleration. Cisco 1841 series also has built-in DHCP (dynamic host configuration protocol) server functionality. When the cisco 1841 prix is configured to act as a DHCP server, it assigns an Internet Protocol address to each device that joins the local network. You can configure a Cisco 1841 to act as a DHCP server.
 
What you need as follows:
Computer connected to the router's console portTerminal emulatorAdministrator access 
How to Configure a DHCP Server on a cisco router 1840
1. Launch the terminal emulator utility on the computer. For example, if you are using Putty as a terminal emulator, double-click on the "Putty" icon on the computer's desktop.
 
2. Type "en" and press "Enter" to enter privileged mode. Enter the administrator's password for the router. Type "configure terminal" and press "Enter."
 
3. Type the following command to configure the domain name common to all hosts on the local network:
IP domain name tarugo.com
Replace "tarugo.com" by the domain name corresponding to the local network administered by the router. Press "Enter."
 
4. Configure the server for the Domain Name System, i.e., the server that will convert back and forth between host names and IP addresses:
IP name-server 8.8.8.8
Replace "8.8.8.8" by the IP address of the DNS server. Press "Enter."
 
5. Configure the pool of IP addresses available to the DHCP server:
IP dhcp pool myPool
network 20.15.0.0
import all
 
Replace "myPool" by a name of your choice for the pool being created. Replace "20.15.0.0" by the subnet from which the 1841 will draw IP addresses (20.15.0.0 through 20.15.254.254 in the example). Press "Enter" after each command. At that point, the  cisco 1841 part number will be fully configured for its role of DHCP server.

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