PingingLab-3.13 basic DHCP Configuration

3.13 basic DHCP Configuration

Purpose:

1. master the basic DHCP configuration to realize automatic Address allocation.

2. Understand how DHCP works.

Tutorial topology:

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Tutorial steps:

1. Set up the DHCP service on SW1 Based on the topology in the figure to dynamically provide IP information for hosts with different VLANs. The configuration is as follows:

SW1 (config) # ip dhcp pool VLAN10 [PL1]

SW1 (dhcp-config) # network 192.168.10.0 255.255.255.0 [PL2]

SW1 (dhcp-config) # default-router 192.168.10.254 [PL3]

SW1 (dhcp-config) # dns-server 8.8.8.8 114.114.114.114 [PL4]

SW1 (dhcp-config) # lease 7 [PL5]

SW1 (dhcp-config) # exit

SW1 (config) # ip dhcp pool VLAN20

SW1 (dhcp-config) # network 192.168.20.0 255.255.255.0

SW1 (dhcp-config) # default-router 192.168.255.254

SW1 (dhcp-config) # dns-server 8.8.8.8 114.114.114.114

SW1 (dhcp-config) # lease 7

SW1 (dhcp-config) # exit

2. Set the IP address in the DHCP Client as the dynamic learning mode as follows:

PC1 (config) # int f0/0

PC1 (config-if) # ip address dhcp [PL6]

PC1 (config-if) # exit

PC2 (config) # int f0/0

PC2 (config-if) # ip address dhcp

PC2 (config-if) # exit

3. Check DHCP allocation as follows:

① On the DHCP Client, check whether the address has been learned

PC1 # show ip int brief

InterfaceIP-AddressOK?MethodStatusProtocol

FastEthernet0/0192.168.10.1 YESDHCP[PL7]UpUp

PC2 # show ip int brief

InterfaceIP-AddressOK?MethodStatusProtocol

FastEthernet0/0192.168.20.1 YESDHCPUpUp

From the above, we can see that the IP address of the PC has been learned, and the address learning mode has changed from manual mode to DHCP mode.

② Check DHCP address pool allocation on the DHCP Server

R1 # show ip dhcp pool

Pool VLAN10:

Utilization mark (high/low)100/0

Subnet size (first/next)0/0

Total addresses254[PL8]

Leased addresses: 1[PL9]

Pending event: None

1 subnet is currently in the pool:

Current indexIP address rangeLeased addresses

192.168.10.2192.168.10.1-192.168.10.2541

Pool VLAN20:

Utilization mark (high/low)100/0

Subnet size (first/next)0/0

Total addresses254

Leased addresses: 1

Pending event: None

1 subnet is currently in the pool:

Current indexIP address rangeLeased addresses

192.168.20.2192.168.20.1-192.168.255.2541

Check the DHCP address allocation and host information as follows:

R1 # show ip dhcp binding

Bindings from all pools not associated with VRF:

IP addressClient-ID/Lease expirationType

Hardware address/

User name

192.168.10.10063.6973.636f.2d63.Mar 08 2002 AMAutomatic

6330.352e.3330.3963.

2e30. 3030.302d.4661.

302f. 30

192.168.20.10063.6973.636f.2d63.Mar 08 2002 AMAutomatic

6330.362e.3330.3963.

2e30. 3030.302d.4661.

302f. 30

From the above results, we can see that by deploying DHCP technology, you can make it easier for hosts to access the network. Especially in the mobile Internet era, DHCP technology has become increasingly important. Various terminals, such as PCs, mobile phones, and tablets, need to connect to the network more conveniently, DHCP technology is also widely used in public Wi-Fi sites such as public transit, subway, and coffee shops. This experiment is complete.

[PL1]Define a DHCP address pool. The address pool name should be linked to the assigned Department or VLAN to facilitate management.

[PL2]Defines the CIDR Block of the address pool.

[PL3]Define the default gateway.

[PL4]Define a DNS server. Multiple DNS servers can be defined to implement active/standby. Generally, the first DNS address is the primary DNS address.

[PL5]Defines the address release time, which is 7 days.

[PL6]Set the interface to dynamically obtain the address through DHCP.

[PL7]The address acquisition method changes from manual to DHCP.

[PL8]Total number of addresses in this address pool.

[PL9]The number of allocated addresses.

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