A lab environment
GNS3, VMware (built a Linux system, two sets of Windows10 system)
Two dhcp Features Overview
1dhcp Profile
DHCP (Dynamic Host Configuration Protocol, Dynamic Host Configuration Protocol) is generally used in large local area network environment, the main role is to centralize the management, assign an IP address, the host to dynamic network environments to obtain an IP address, Gateway address, DNS server addresses and other information, and be able to enhance the utilization of addresses.
DHCP adopts a client / server model, a host address dynamically assigned tasks driven by a network host. When the DHCP server receives the application information from the network host address, the address will be sent to the relevant configuration information to the network host, to achieve a dynamic allocation of network host address information.
2 dhcp function
- Ensure that any IP address can only be used by a DHCP client at the same time.
- DHCP can be permanently assigned a fixed IP address to the user.
- DHCP can be obtained with other methods coexist host IP address (e.g., manually configure the IP address of the host).
- DHCP server should provide service to existing BOOTP clients.
3 dhcp distribution
1 automatic allocation (Automatic Allocation), DHCP server assign a permanent IP address for the host, once the DHCP client for the first time successfully leased from the DHCP server to the IP address, you can use that address permanently.
2 dynamic allocation (Dynamic Allocation), DHCP server specifies the IP address to a host having a time limit, the time expires, or when the host discard the clear address, which can be used by other hosts.
3 manual distribution (Manual Allocation), IP address of the client is specified by the network administrator, DHCP server assigned IP address will only tell the client host.
Three types of addresses distribution, only the dynamic allocation can be reused address of the client no longer needed.
4 dhcp advantage
1 reduces the time to configure and deploy equipment.
2 reduces the possibility of configuration errors.
3 IP address can be centrally managed distribution equipment
Three dhcp relay service set up
Build the topology shown below in the GNS3, host3 for a Linux system, as dhcp server. Because to create a vlan, switches, and three switches need to set the virtual memory
Dhcp service is installed on a Linux system
After installation is complete, the card host3 VMnet1 changed, two sets of additional cards to VMnet2 windowns10 and the VMnet8, are off the network, only the master mode. VMnet8 which changed only need to reconfigure the host mode, the card set up, configure host3 card address.
Host3 After configuration is complete, restart card services, check whether success
In GNS3 wherein R1, R2 configuration vlan
(1) R 1
Creating vlan
The link f1 / 0 interface resides made trunk
Vlan10,20,30 virtual interface to configure the gateway
Check whether the configuration take effect
The gateway relaying the dhcp
(2) R 2
Close routing function to create vlan
To the interface is divided vlan
Check whether the configuration is successful
The dhcp service on Linux systems
/Etc/dhcp/dhcpd.conf enter the dhcp
Configuration is complete, save, restart the service, see
Verify the configuration.
The test results, two sets windowns10 machine automatically obtain an IP address, and not on the same network segment and communicate host3
Assign a fixed ip address
Restart the service, see the results
