DHCP service (Dynamic Host Configuration Protocol) automates the delivery of the individualized network settings to LAN clients. In the DHCP server network you can dynamically set for all network devices an IP address, gateway, DNS, WINS address etc.
To turn on the DHCP server, use the “Services – DHCP Server – Add interface” item in UserGate Administration Console or press the “Add” button in Control Panel. In the dialog window that appears, select the network interface where the DHCP server will run. For the minimal DHCP server configuration it is enough to set the following parameters: IP address range (address pull)—the range of addresses to provide the addresses delivery to LAN clients by the server, the network mask and the rent time. The maximum pull size in UserGate is 4000 addresses. You can exclude some IP addresses from the address pull by using the “Exclude” button. You can also attach a permanent IP address to a particular network device by creating an attachment in the “Reservation” section. IP address permanency during rent receiving and prolongation is provided via the network device MAC address attachment. To create new attachment, please enter the IP address only; the MAC address will be defined automatically when you press the corresponding button.
Figure 6. DHCP server settings.
UserGate DHCP server supports the importing of the settings from the Windows DHCP server . You should save the Windows DHCP settings to a file first. To this effect, please launch the Windows command prompt (Start – Run – “cmd”) and type: netsh dhcp server IP dump > file_name, where IP is your DHCP server’s IP address.
Already delivered IP addresses are shown in the lower part of the Administration Console dialog window (Fig.7) along with the client information (workstation name, MAC address) and rent timing characteristics. A delivered IP address can be released by right clicking on it and selecting “Remove Client” in the pop-up menu.
Figure 7. Delivered address removal.
The released IP is again placed to the pull after a certain period of time. The IP release option becomes useful if a workstation received an IP address and it is taken offline later.