What is DHCP? The DHCP (Dynamic Host Configuration Protocol) is an Internet protocol responsible for automating the configuration of computers which use TCP/IP. DHCP can be used to assign IP addresses to computers by delivering TCP/IP configuration addresses such as IP address, subnet masks, default routers and DNS addresses. It can also be used to provide information for a number of other services such as printers, time, news and TFTP servers. Config A Cisco router can be configured as a DHCP server to assign IP addresses. The range of IP addresses which can be given out is called a 'pool'. From this pool clients are leased addresses for a given time, after which the lease expires and the client needs to request a new IP address lease. The following config lines show how to setup a DHCP pool of addresses in the 192.168.0.0 IP range: no ip dhcp conflict logging ip dhcp excluded-address 192.168.0.1 192.168.0.50 ! ip dhcp pool 1 network 192.168.0.0 255.255.255.0 default-route
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