DHCP Manager

DHCP Manager is a Java-based graphical interface you can use to perform administration tasks on the DHCP service.

The DHCP Manager Window

The DHCP Manager window's appearance differs, depending on whether the server on which it is running was configured as a DHCP server or a BOOTP relay agent.

When the server is configured as a DHCP server, DHCP Manager uses a tab-based window, in which you select a tab for the type of information you want to work with. DHCP Manager features the following tabs:

• Addresses - Lists all networks and IP addresses placed under DHCP management. From the Addresses tab, you can add or delete networks, and add or delete IP addresses individually or in blocks. You can also modify the properties of individual networks or IP addresses, or make the same property modifications for a block of addresses simultaneously. When you start DHCP Manager, it opens on the Addresses tab.

• Macros - Lists all macros available in the DHCP configuration database (dhcptab) and the options contained within them. From the Macros tab, you can create or delete macros, and modify them by adding options and providing values for the options.

• Options - Lists all options that have been defined for this DHCP server. Options listed on this tab are not the standard ones defined in the DHCP protocol; the options are extensions to the standard options, having a class of Extended, Vendor, or Site. Standard options cannot be changed in any way so they are not listed here.

The following figure shows the DHCP Manager window as it appears when you start it on a DHCP server.

Figure 11-1 DHCP Manager Running on a DHCP Server System

When the server is configured as a BOOTP relay agent, the DHCP Manager window does not show these tabs because the BOOTP relay agent does not need any of this information. You can only modify the BOOTP relay agent's properties and stop/start the DHCP daemon with DHCP Manager. The following figure shows the DHCP Manager window as it appears when you start it on a system configured as a BOOTP relay agent.

Figure 11-2 DHCP Manager Running on a BOOTP Relay Agent System

DHCP Manager Menus

DHCP Manager menus include:

• File - Exit DHCP Manager

• Edit - Perform management tasks upon networks, addresses, macros, and options

• View - Change the look of the tab currently selected

• Services - Manage the DHCP daemon

• Help - Open your web browser and display help for DHCP Manager

When DHCP Manager is run on a BOOTP relay agent, the Edit and View menus are disabled.

All DHCP service management activities are accomplished through the Edit and Service menus. You use the commands in the Edit menu to create, delete, and modify networks, addresses, macros, and options, depending on which tab is selected. When the Addresses tab is selected, the Edit menu also lists wizards, which are sets of dialogs that make it easy to create networks and multiple IP addresses. The Services menu lists commands for managing the DHCP daemon, enabling you to start/stop, enable/disable, modify the server configuration, and unconfigure the server.

Starting and Stopping DHCP Manager

You must run DHCP Manager on a DHCP server system as superuser, but you can display it remotely on another UNIX system using the X Windows remote display feature.

How to Start DHCP Manager

1. (Optional) Become superuser on the DHCP server machine.

2. If you are logged in to the DHCP server machine remotely, you can display DHCP Manager on your local machine as follows.

   1. Type the following on the local machine:

      # xhost +server-name

   2. Type the following on the remote DHCP server machine:

      # DISPLAY=local-hostname;export DISPLAY

3. Type the following command:

   # /usr/sadm/admin/bin/dhcpmgr &

   The DHCP Manager window opens, displaying the Addresses tab if the server is configured as a DHCP server, or no tabs if the server is configured as a BOOTP relay agent.

How to Stop DHCP Manager

Choose Exit from the File menu.