DHCP principle and configuration

Catalog

Preface

1. understand DHCP service

1.1 understand DHCP service

1.2 understand DHCP service

1.3 understand DHCP service

1.4DHCP Lease process

2.DHCP Lease process  

2.1DHCP Lease process  

2.2DHCP Lease process  

2.3DHCP Lease process  

2.4DHCP Lease process  

3.DHCP Configuration of

summary

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Preface

1.DHCP What is the principle of ？DHCP What is the configuration of the server ？DHCP Client side usage ？ DHCP Relay principle and configuration ？

1. understand DHCP service

1.1 understand DHCP service

DHCP (Dynamic HostConfiguration Protocol, Dynamic Host Configuration Protocol ) from lnternet Task team design and development
Used exclusively for TCP/IP Computers in the network automatically assign TCP/IP Parameter Co

1.2 understand DHCP service

Use DHCP The benefits of
Reduce the workload of Administrators
Avoid the possibility of input errors
avoid IP Address conflict
When changed IP Address segment , There is no need to reconfigure each user's IP Address
Improved IP Address utilization
Facilitate client configuration

1.3 understand DHCP service

DHCP The way of distribution
Automatically assigned :( Assigned to a IP Permanent use after address
Manually assign : from DHCP The server administrator specifically specifies IP Address
Dynamic allocation : Release the after use IP, For other clients

1.4DHCP Lease process

Client from DHCP Server get IP The process of addressing is called DHCP Lease process There are four steps
(1) The client searches the network for servers
(2) The server responds to the client service
(3) The client sends a service request to the target server
(4） The server provides services to the client

2.DHCP Lease process  

2.1DHCP Lease process  

Client requests IP Address
When one DHCP When the client starts , The client has not IP Address , So the client has to go through DHCP Get a legal address here DHCP The client sends... By broadcast DHCPDiscover Find information to look for DHCP The server  

2.2DHCP Lease process  

Server response
DHCP The server received a request from the client IP Address information when , In their own IP Check the address pool to see if there is any legal IP Address to client , If there is ,DHCP The server will IP Mark the address , Add to DHCP Offer In the news of , And then broadcast ─ be DHCP Offer news  

2.3DHCP Lease process  

Client selection IP Address
DHCP The client receives the first DHCP Offer Extract... From the message lP Address , issue IP Address of the DHCP The server keeps the address , In this way, the address can no longer be assigned to another DHCP The client  

2.4DHCP Lease process  

The server determines the lease
1）DHCP The server receives DHCP Request After the news , With DHCPACK Broadcast a successful acknowledgement to the client in the form of a message , The message contains IP Valid lease and other configurable information for the address
2） When the client receives DHCDACK When the news ,( To configure IP Address ), complete TCP/IP The initialization

3.DHCP Configuration of

 

 

 

 

 cloud The options in

 

 

 

 

 LSW1

 

 

 

 

  Restart the network

 

 

 

 

summary

1.DHCP How it works
（1) The client searches the network for servers
  (2) The server responds to the client service
  (3) The client sends a service request to the target server
  (4） The server provides services to the client
2.DHCP Configuration method of
3.DHCP Client acquisition IP Address
4.DHCP Relay principle and configuration