Cisco 2501 - Router - EN Manual do Utilizador descarregar pdf (Página 41)

Router Interfaces

219

Configuring DHCP on your router

You can configure your router to become a Dynamic Host Configuration Protocol

(DHCP) server, and I’ll show you some examples at the end of this chapter and on a

real network in Chapter 6 “IP Routing.” Here are some basics of making your router

a DHCP server.

First, create a name for the pool. The name is completely irrelevant, but using a name

allows you to create an unlimited amount of DHCP pools. A pool is defined as a subnet

or group of IP addresses you want the DHCP server to hand out to DHCP clients.

Second, use the network command to define the subnet of address the DHCP pool will

hand out to the DHCP clients

Third, set the optional options such as default gateway, DNS server, WINS server,

domain name, and lease length. A DHCP lease specifies the amount of time a DHCP

server grants a DHCP client permission to use a particular IP address.

Here is an example:

Todd#config t

Todd(config)#ip dhcp pool Finance

Todd(dhcp-config)#network 10.10.1.0 255.255.255.0

Todd(dhcp-config)#default-router 10.10.1.1

Todd(dhcp-config)#dns-server 10.30.1.1

Todd(dhcp-config)#netbios-name-server 10.30.1.1

Todd(dhcp-config)#lease 0 0 1

Todd(dhcp-config)#exit

Todd(config)#ip dhcp excluded-address 10.10.1.1 10.10.1.199

Todd(config)#

The above commands create a DHCP pool that will be used for DHCP clients connecting

to a router interface with an IP address of 10.10.1.1 (the configured default gateway). The

DNS and WINS server is 10.30.1.1 and the IP addresses that will be handed out to DHCP

clients will be 10.10.1.200 through 10.10.1.254 because the excluded range is 10.10.1.1

through 10.10.1.199. The lease command is configured in days, hours, minutes. The lease

0 0 1 command is a one-minute DHCP lease.

You need to verify and configure the router interface the DHCP clients are connected to

with the correct IP address:

Todd(config)#iinteface f0/0

Todd(config-if)#ip address 10.10.1.1 255.255.255.0

Todd(config-if)#no shutdown

You can also configure a router interface to receive a DHCP address. You would

do this, for example, if your router was connected to a DSL or cable connection to the

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Cisco 2501 - Router - EN Manual do Utilizador Página 41