Chapter 10

Administering DHCP (Task)

This chapter describes tasks you might find useful when you administer the Solaris DHCP service. The chapter includes tasks for the server, BOOTP relay agent, and client. Each task includes a procedure to help you perform the task in DHCP Manager and a procedure for the equivalent task with DHCP command-line utilities. DHCP command-line utilities are more fully documented in man pages.

You should have already completed the initial configuration of your DHCP service and initial network before you use this chapter. Chapter 9, Configuring DHCP Service (Task) discusses DHCP configuration.

The chapter contains the following information:

• "DHCP Manager"

• "Setting Up User Access to DHCP Commands"

• "Starting and Stopping the DHCP Service"

• "Modifying DHCP Service Options (Task Map)"

• "Adding, Modifying, and Removing DHCP Networks (Task Map)"

• "Supporting BOOTP Clients with DHCP Service (Task Map)"

• "Working With IP Addresses in the DHCP Service (Task Map)"

• "Working With DHCP Macros (Task Map)"

• "Working With DHCP Options (Task Map)"

• "Supporting Solaris Network Installation with the DHCP Service (Task Map)"

• "Supporting Remote Boot and Diskless Boot Clients (Task Map)"

• "Setting Up DHCP Clients as NIS+ Clients"

• "Converting to a New Data Store"

• "Moving Configuration Data Between DHCP Servers (Task Map)"

DHCP Manager

DHCP Manager is a 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, and have 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 10-1 DHCP Manager 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 10-2 DHCP Manager 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

• Service - Manage the DHCP daemon and data store.

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

When DHCP Manager runs 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 Service menu lists commands that enable you to manage the DHCP daemon. You can start/stop, enable/disable, modify the server configuration, and unconfigure the server. The Service menu also lists commands that enable you to convert the data store and export and import data on 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 Window remote display feature.

How to Start and Stop DHCP Manager

1. (Optional)

   Become superuser on the DHCP server system.

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

   1. Type the following on the local system:

      # xhost +server-name

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

      # 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.

4. To stop the DHCP Manager, choose Exit from the File menu.

   The DHCP Manager window closes.