Enabling the DHCP Relay Agent to implement cross-subnet services

Along with the gradual enlargement of the LAN scale, a network is divided into several different subnets, in order to realize the individualized management requirement according to the work requirements of different subnets. Considering that larger LANs typically use a DHCP server to assign IP addresses to each workstation, but once the LAN is divided into multiple subnets, do we have to create a DHCP server in each of the different subnets to provide IP address assignment services for workstations in each subnet? If this is the case, not only the operation of trouble not to say, but also not conducive to the efficient management of LAN network. In fact, as long as we enable the Windows Server System built-in Relay Agent function, the original DHCP server can be used to provide IP address allocation services for a number of different subnets; below, the author of a DHCP server for two subnets to provide address assignment services for example, To give you a detailed description of how to enable the DHCP Relay Agent to assist workstations in different subnets to complete the task of requesting IP addresses across subnets.

Get ready for the job

Assuming that there is a workstation with a Windows Server 2003 system installed on one of the subnets of the LAN, I am now ready to enable the DHCP Relay Agent function on this computer to provide IP addresses for other subnets in the LAN for transit services. However, before enabling the DHCP Relay Agent feature, we need to configure the workstation as a virtual router to enable the router to connect two different subnets in the local area network.

Given that the Windows Server 2003 system does not have the Routing and Remote Access service enabled by default, we must first install the service by manual means. When you install the service, you can click the Start/Settings/Control Panel commands in turn. In the Open System Control Panel window, double-click the Administrative Tools icon, and then double-click the Routing and Remote Access project in the following interface, so that the system automatically opens the Routing and Remote Access interface as shown in Figure 1; Right-click the local computer icon in the interface, run the Configure and enable Routing and Remote Access command from the pop-up right-click menu to open the Routing and Remote Access Server Setup Wizard window, click the Next button in the window to enter the wizard configuration interface as shown in Figure 2, and select the Custom configuration option, click the Next button, select the LAN routing option in the wizard window that appears (as shown in Figure 3), and then click Finish to exit the Routing and Remote Access Server Setup Wizard window.

Figure 1

Figure 2

Figure 3