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Configuring DHCP
DHCP Configuration Task List
IPC-73
Cisco IOS IP Configuration Guide
Configuring a DHCP Server Boot File
The boot file is used to store the boot image for the client. The boot image is generally the operating
system the client uses to load. To specify a boot file for the DHCP client, use the following command in
DHCP pool configuration mode:
Configuring the Number of Ping Packets
By default, the DHCP Server pings a pool address twice before assigning a particular address to a
requesting client. If the ping is unanswered, the DHCP Server assumes (with a high probability) that the
address is not in use and assigns the address to the requesting client. To change the number of ping
packets the DHCP Server should send to the pool address before assigning the address, use the following
command in global configuration mode:
Configuring the Timeout Value for Ping Packets
By default, the DHCP Server waits 500 milliseconds before timing out a ping packet. To change the
amount of time the server waits, use the following command in global configuration mode:
Enabling the Cisco IOS DHCP Client on Ethernet Interfaces
To acquire an IP address via DHCP on an Ethernet interface, use the following command in interface
configuration mode:
Command Purpose
Router(dhcp-config)# bootfile filename
Specifies the name of the file that is used as a boot image.
Command Purpose
Router(config)# ip dhcp ping packets
number
Specifies the number of ping packets the DHCP Server sends to a pool
address before assigning the address to a requesting client. The default is
two packets. Setting the count argument to a value of 0 turns off DHCP
Server ping operation completely.
Command Purpose
Router(config)# ip dhcp ping timeout milliseconds
Specifies the amount of time the DHCP Server must wait before
timing out a ping packet. The default is 500 milliseconds.
Command Purpose
Router(config-if)# ip address dhcp [client-id interface name]
[hostname host-name]
Specifies that the Ethernet interface acquires an IP
address through DHCP.