Configuration of the same network segment DHCP

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Scenario: Configure DHCP on the same network segment by simulating the PC and dhcp_server with the router. When the PC interface is configured to dynamically obtain an address, the PC broadcasts a dhcp_discover message to discover the DHCP server, where multiple DHCP servers may broadcast a reply Dhcp_offer message after receiving the message, and the PC will only pick one and then broadcast DHCP_ Request tells the server to ask for this address, and the server checks to reply Dhcp_ack, so that the address is completed.

Operation Steps:

Step One: Build the experimental environment according to the topology

Step two: Simulate the PC with the router, turn off the routing function and configure the interface to get the IP dynamically

PC (config) #no iprouting// Turn off the routing feature

PC (config) #intf0/0

PC (config-if) #ip add

PC (config-if) #ipaddress DH

PC (config-if) #ipaddress DHCP// Configure the interface to obtain IP dynamically

Step Three: Configure the interface address, DHCP address pool, and lease information in Dhcp_server

Dhcp_server (config) #

Dhcp_server (config) #intf0/0

Dhcp_server (config-if) #ipadd 192.168.10.254 255.255.255.0

Dhcp_server (config-if) #

Dhcp_server (config-if) #nosh

dhcp_server (config) #ipdhcp pool dhcp_pool_1// Configure the address pool name for DHCP

dhcp_server (Dhcp-config) #network192.168.10.0 255.255.255.0// Configuring DHCP address ranges

dhcp_server (dhcp-config) #default-router192.168.10.254// Configure the gateway assigned to the host

dhcp_server (dhcp-config) #lease0 8 0// the rental period is 0 days, 8 hours, 0 minutes .

Dhcp_server (Dhcp-config) #ex

dhcp_server (config) #ipdhcp excluded-address 192.168.10.250 192.168.10.254// in the address pool

Addresses that need to be excluded

Step four: Use Wireshark to observe the DHCP acquisition process

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Step five: View interface address availability

pc#sh IP int b

Interface ip-address OK? Method Status Protocol

fastethernet0/0 192.168.10.2 YES DHCP up up

fastethernet1/0 Unassigned YES unset administratively down

Configuration file

------------------------------------------------------------------------------

Pc#sh Run

Buildingconfiguration ...

Version 12.4

No IP routing

!

!

......

!

Interface fastethernet0/0

IP address DHCP

No IP route-cache

Duplex Auto

Speed auto

!

!

......

!

End

-------------------------------------------------------------------------------

Dhcp_server#sh Run

Buildingconfiguration ...

!

Version 12.4

!

Hostname dhcp_server

!

!

!

IP CEF

No IP dhcp use vrfconnected

IP dhcpexcluded-address 192.168.10.250 192.168.10.254

!

IP DHCP Pooldhcp_pool_1

Network 192.168.10.0 255.255.255.0

Default-router 192.168.10.254

Lease 0 8

!

!

interfacefastethernet0/0

IP address 192.168.10.254 255.255.255.0

Duplex Auto

Speed auto

!

.........

!

!

End

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This article is from "the synthesizer, the United States Tiancheng" blog, please be sure to keep this source http://kidjang.blog.51cto.com/9975340/1769364

Configuration of the same network segment DHCP