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There are cases, especially in small networks, where a Cisco router must also function as a DHCP server.  Setting up a basic DHCP server on your router is a snap!  Multiple address pools can be defined if you need to set up a DHCP server on more than one interface.

Sample configuration:

ip dhcp excluded-address 192.168.1.1 192.168.1.50
ip dhcp pool 1
        network 192.168.1.0 255.255.255.0
        default-router 192.168.01.1
        domain-name corvettekenny.com
        dns-server 1.2.3.4

That's it!  Note that the "network" command tells the router which physical interface the DHCP pool will serve.