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Configuring DHCP
Configuration Examples
IPC-79
Cisco IOS IP Configuration Guide
DHCP Server Options Import and Autoconfiguration Example
The following example shows a remote and central server configured to support DHCP options import
and autoconfiguration. The central server is configured to automatically update DHCP options, such as
DNS and WINs addresses, within the DHCP pools. In response to a DHCP request from a local client
behind CPE equipment, the remote server can request or “import” these option parameters from the
centralized server. See Figure 16 for a diagram of the network topology.
Figure 16 DHCP Example Network Topology
Central Router
!do not assign this range to DHCP clients
ip dhcp-excluded address 10.0.0.1 10.0.0.5
!
ip dhcp pool central
! Specifies network number and mask for DHCP clients
network 10.0.0.0 255.255.255.0
! Specifes the domain name for the client
domain-name central
! Specifies DNS server that will respond to DHCP clients when they need to correlate host
! name to ip address
dns-server 10.0.0.2
!Specifies the NETBIOS WINS server
netbios-name-server 10.0.0.2
!
interface FastEthernet0/0
ip address 10.0.0.1 255.255.255.0
duplex auto
speed auto
Remote Router
!
ip dhcp pool client
! Imports DHCP options parameters into DHCP server database
import all
network 20.0.0.0 255.255.255.0
!
interface FastEthernet0/0
ip address dhcp
duplex auto
Local DNS
server
Central
router
Remote
router
PC/client
10.0.0.2 10.0.0.1
FE0/0 FE0/0
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