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Figure 5-17 Network diagram of DHCP 

For different DHCP clients, DHCP server provides three IP address assigning methods: 

(1) 

Manually assign the IP address: Allows the administrator to bind the static IP address to a 
specific client (e.g.: WWW Server) via the DHCP server. 

(2) 

Automatically assign the IP address: DHCP server assigns the IP address without an 
expiry time limitation to the clients. 

(3) 

Dynamically assign the IP address: DHCP server assigns the IP address with an expiry 
time. When the time for the IP address expired, the client should apply for a new one.   

Most clients obtain IP addresses dynamically, which is illustrated in the following figure.   

 

Figure 5-18 Interaction between a DHCP client and a DHCP server 

（

1）  DHCP-DISCOVER Stage: The Client broadcasts the DHCP-DISCOVER packet to find 

the DHCP server. 

（

2）  DHCP-OFFER Stage: Upon receiving the DHCP-DISCOVER packet, the DHCP server 

selects an IP address from the IP pool according to the assigning priority of the IP 
addresses and replies to the client with DHCP-OFFER packet carrying the IP address and 
other information. 

（

3）  DHCP-REQUEST Stage: In the situation that there are several DHCP servers sending the 

DHCP-OFFER packets, the client will only respond to the first received DHCP-OFFER