DHCP is the network protocol which allows nodes to obtain IP-address and other necessary network parameters automatically. It allows to avoid manual setup of workstations in the LAN and reduces the mistakes. DHCP is a client-server protocol: to be automatically configured, the workstation-client requests server and get the necessary parameters from it. In the DHCP module you can turn on/off the DHCP-server, check its performance, and set some parameters.
The setup for DHCP is separate for every LAN and is located in the “Providers and networks” module. To allow DHCP in a LAN, you need to edit the LAN, enable “Allow DHCP in this network” option, and set a range of IP-addresses that will be given to this LAN’s nodes (syntax should be either like 192.168.1.1-192.168.1.100, or like 192.168.1.1\16).
If DHCP is not allowed for any LAN, then DHCP service status will be “not set”.
On the “Settings” tab you can set the time servers, DNS and WINS-servers, which will be used on the nodes. Apart from that you can set path to TFTP-server here, which is necessary for some configurations (for thin clients, for example), and also the time period for which IP-address will be reserved for the node (lease period). Also you can set a DNS-zone for auto-registration. This way when a new workstation obtain an IP from the DHCP-server, an A-record will be created for him looking as Netbios-name.domain. Also you can turn on automated distributing of a proxy parameters from ICS or from some other server.
On the “Addresses” tab you can see all the users which are currently obtaining addresses via DHCP. If you would like nodes to obtain the same IP every time, you need to make a connection between it’s MAC-address and the IP-address. To create a connection while this IP is leased, you can use the button “Connect IP with MAC”. The connections from the “ARP table” module will be also used by the DHCP-server to lease IPs. To give to a user another IP, copy the MAC-address and press “Add” - “DHCP address”. Enter the MAC and set the new IP. The change will be applied when the lease period will be over, or when a user will connect anew. For IP-addresses set for users, the owner’s names will be shown. If you click on the user name, you will be redirected to his page.
DHCP-server uses the same list of the IP and MAC addresses connections, as the ARP table.
On the “Log” tab you can find a summary of all system messages of the DHCP service. Log is divided into pages, you can navigate between pages using “Next” and “Previous” buttons, or enter the page number to proceed to it directly.
Log entries are marked with color depending on its type. Normal messages are while, system statuses (Enabling/Disabling) are green, errors are red.
In the top right corner there is a search line. You can use it to look for specific log entries. Log always shows events of the current date. To check the messages from some other date, you can pick one in the calendar in the top left corner of the module.
If necessary, you can save log in a file, using the “Export” button.