Specific process of configuring DHCP

DHCP can also be set for routing and switching. So how to set it? Sometimes, some medium and high-end network equipment routers and switches have already integrated the DHCP service, so we can implement the DHCP service on the network equipment without using a dedicated host as the DHCP server, to save costs.

The following is an instance for configuring DHCP on a cisco router.

1. Specify the range of IP addresses that are not automatically allocated

 
 

  
  
Ip dhcp excluded-address 10.1.1.1 10.1.1.19 // the ip address from 10.1.1.1 to 10.1.1.19 is manually assigned.
 
 

2. Set the DHCP address pool

 
 

  
  
Ip dhcp pool global // This command specifies the name of the DHCP address pool
  
  
Network 10.1.0.0 255.255.0.0 // dynamically assigned IP address range, except for the non-automatically assigned IP addresses specified before all IP addresses in the 10.1.0.0 segment)
 
 

3. Set DHCP Additional information

 
 

  
  
Domain-name client.com//configure the domain suffix for the customer's machine
  
  
Dns-server 10.1.1.1 10.1.1.2 // configure the DNS server address for the client, which is 10.1.1.1 and 10.1.1.2
  
  
Netbios-name-server 10.1.1.5 10.1.1.6 // configure the WINS server address for the client, which is 10.1.1.5 and 10.1.1.6
  
  
Netbios-node-type h-node // configure the node mode for the client to affect the name interpretation. For example, h-node is explained by the wins server first)
  
  
Default-router 10.1.0.100 10.1.0.101 // configure the default gateway for the client
 
 

4. Set the lease term

 
 

  
  
Lease 8 // set the lease time to 8 days
 
 

5. Sometimes we need to set the DHCP server sub-address pool. For example, we want the client gateway of 10.1.1.0/24 to be 10.1.1.100. We set it as follows:

 
 

  
  
Ip dhcp pool subglobal
  
  
Network 10.1.1.0 255.255.255.0 // The Sub-address pool of global, which inherits domain name and other options from global
  
  
Default-router 10.1.1.100 10.1.1.101 // configure the default gateway for the client
 
 

6. Related DHCP Debugging commands

 
 

  
  
No service dhcp // stop the DHCP service
  
  
Show ip dhcp binding // display Address Allocation
  
  
Show ip dhcp conflict // displays ip address conflicts.