Copyright (C) 1997, 1998 by International Business Machines Corporation

# TCP/IP Configuration Notebook Online Help

## Configuring LAN Adapter Interfaces

This task describes how to configure up to eight LAN adapter interfaces. To do this task, use the Configure Network Interface Parameters--Basic Options page on the Network tab.

Before you start, ask your network administrator if the computer being configured has access to a DHCP server. DHCP, or Dynamic Host Configuration Protocol, automatically assigns an IP address and configures TCP/IP every time you start the computer. DHCP is especially useful for "mobile" computing.

Note: You can configure no more than one DHCP LAN interface. If you opt to configure a DHCP interface, you may switch the "dynamic" aspect of this TCP/IP configuration on and off as desired by checking or unchecking the "Use previous DHCP Configuration on reboot" box on the Basic sub-tab of the Network tab.

Also ask your administrator if you are in a dynamically updatable zone. If so, DDNS, the Dynamic Domain Name Server, enables the client computer to dynamically and directly register its name and address mappings in the DDNS tables. This eliminates the need for network administrators to manually perform the updates.

Once you know the configuration options available to you, configure your LAN adapter interfaces as follows:

1. Select the Network tab.

2. Select the Basic sub-tab.

3. Select a LAN adapter from the Interface to Configure list box.

4. Under Configuration Options, check the Enable Interface box. This runs TCP/IP on the selected LAN adapter the next time you restart your computer.

5. Do one of the following:

   - If the adapter is to be a DHCP interface, do this (note that DHCP configures only one interface; if additional interfaces are needed you must configure them as Manual interfaces):

     1. Under the Configuration Options, select Automatically, Using DHCP. This allows DHCP to dynamically configure this computer for TCP/IP each time you restart the computer on the selected LAN adapter.

        Note: If on the Printing tab a remote print server or remote print server's printer is specified, these entries will override any values DHCP assigns. Consider removing these entries if you intend for DHCP to assign a server and printer automatically. Be advised, though, that if you remove the server and printer entries from the Printing tab, there will be no default print server and printer for any non-DHCP LAN interfaces defined on the Network tab.

        On the Routing tab, however, if a router for the DHCP LAN interface is specified, DHCP will override that value with its own routing information. Routes associated with any non-DHCP LAN interfaces will not be affected.

     2. Check this box to use IP address and TCP/IP configuration retained by DHCP from a previous startup. Uncheck this box to have DHCP refresh the IP address and TCP/IP configuration each time this computer is started. The default is to refresh the TCP/IP configuration at each startup.

     3. If you are in a dynamically updatable zone, check Also Using DDNS. The next time you restart your computer, a DDNS Client Configuration window will appear. Use this window to configure the computer so that the Dynamic Domain Name Server automatically updates the appropriate tables with your host name and your DHCP-assigned IP address.

   - If the adapter is to be a non-DHCP interface, do this:

     1. Under the Configuration Options, select Manually, Using.

     2. Type the IP Address.

     3. Type the Subnet Mask.

6. Repeat these steps to configure additional LAN interfaces.

7. Click OK to exit and save your entries.

Any information specified on this tab is saved in the SETUP.CMD file.

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