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2.7 | ![]() |
DHCP and Easy IP | |
2.7.3 | ![]() |
Configuring IOS DHCP server |
The DHCP server process is enabled by
default on versions of the Cisco IOS that support it. If for some reason
the DHCP server process becomes disabled, it can be re-enabled by using
the
service dhcp
global configuration command. The
no service dhcp
command disables the server.
Like NAT, DHCP servers require that the administrator define a pool
of addresses. In Figure
The first command, ip dhcp pool room12, creates a pool named room12 and puts the router in a specialized DHCP configuration mode. In this mode, use the network statement to define the range of addresses to be leased. If specific addresses are to be excluded on this network, return to global configuration mode.![]() The ip dhcp excluded-address command configures the router to exclude 172.16.1.1 through 172.16.1.10 when assigning addresses to clients. The ip dhcp excluded-address command may be used to reserve addresses that are statically assigned to key hosts.A DHCP server is capable of configuring much more than an IP address.
Other IP configuration values can be set from the DHCP configuration
mode.
IP clients will not get very far without a default gateway, which can be set by using the default-router command. The address of the DNS server, dns-server, and WINS server, netbios-name-server, can be configured here as well. The IOS DHCP server can configure clients with virtually any TCP/IP information.Figure
Use the EXEC mode commands to monitor DHCP server operation.
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