Windows - Installing a Loopback Adapter

1 - About

Dynamic Host Configuration Protocol (DHCP) assigns dynamic IP addresses on a network. Dynamic addressing allows a computer to have a different IP address each time it connects to the network. In some cases, the IP address can change while the computer is still connected. You can have a mixture of static and dynamic IP addressing in a DHCP system.

In a DHCP setup, the software tracks IP addresses, which simplifies network administration. This lets you add a new computer to the network without having to manually assign that computer a unique IP address. However, before installing Oracle Database onto a computer that uses the DHCP protocol, you need to install a loopback adapter to assign a local IP address to that computer.

When you install a loopback adapter, the loopback adapter assigns a local IP address for your computer. After you install a loopback adapter on your computer, you have at least two network adapters on your computer: your own network adapter and the loopback adapter.

A loopback adapter is required then if:

  • You are installing on a DHCP computer, or
  • You are installing on a non-networked computer and plan to connect the computer to a network after installation.

Primary adapter

After the installation of the loopback adapter you must confirm that the adapter network card is in primary position. The software (as Oracle Database, EPM, …) needs to have Windows using the loopback adapter to mimic a fix IP.

The primary adapter is determined by the order in which you installed the adapters: it is the last adapter installed. If you install additional network adapters after you install the loopback adapter, you need :

  • to deinstall the loopback adapter and reinstall it or
  • to change the order in the network manager

3 - Checking if a Loopback Adapter Is Installed on Your Computer

To check if a loopback adapter is installed on your computer, run the ipconfig /all command:

SYSTEM_DRIVE:\> ipconfig /all

If there is a loopback adapter installed, you would see a section that lists the values for the loopback adapter. For example:

Ethernet adapter Local Area Connection 2:
  Connection-specific DNS Suffix  . :
  Description . . . . . . . . . . . : Microsoft Loopback Adapter
  Physical Address. . . . . . . . . : 02-00-4C-4F-4F-50
  DHCP Enabled. . . . . . . . . . . : Yes
  Autoconfiguration Enabled . . . . : Yes
  Autoconfiguration IP Address. . . : 169.254.25.129
  Subnet Mask . . . . . . . . . . . : 255.255.0.0

4 - Installing a Loopback Adapter

To install a loopback adapter:

4.1 - Starting the "Add Hardware Wizard"

4.1.1 - Windows 2003, 2000 Windows XP

  • Open the Windows Control Panel.
  • Double-click Add Hardware to start the Add Hardware wizard.

Windows 2000 reports on the last network adapter installed. This means that if you install additional network adapters after you install the loopback adapter, you need to remove and reinstall the loopback adapter. The loopback adapter must be the last network adapter installed on the computer.

4.1.2 - Windows 7

  • Click the Start menu.
  • Search for “cmd“.
  • Right-click on “cmd” and select “Run as Administrator”
  • Enter “hdwwiz.exe”

4.2 - Wizard Steps

  • In the Welcome window, click Next.
  • In the Is the hardware connected? window, select Yes, I have already connected the hardware, and click Next.
  • In the The following hardware is already installed on your computer window, in the list of installed hardware, select Add a new hardware device, and click Next.
  • In the The wizard can help you install other hardware window, select Install the hardware that I manually select from a list, and click Next.
  • From the list of hardware types, select the type of hardware you are installing window, select Network adapters, and click Next.
  • In the Select Network Adapter window, make the following selections:
    • Manufacturer: Select Microsoft.
    • Network Adapter: Select Microsoft Loopback Adapter.

  • Click Next.
  • In the The wizard is ready to install your hardware window, click Next.
  • In the Completing the Add Hardware Wizard window, click Finish.
  • If you are using Windows 2003, restart your computer.

4.3 - Loopback Adapater Settings

  • Right-click My Network Places on the desktop and choose Properties. This displays the Network Connections Control Panel.
  • Right-click the connection that was just created. This is usually named “Local Area Connection 2”. Choose Properties.

  • On the General tab, select Internet Protocol (TCP/IP), and click Properties.
  • In the Properties dialog box, click Use the following IP address and do the following:
    • IP Address: Enter a non-routable IP for the loopback adapter. For instance :
      • 10.10.10.10
      • 192.168.x.x (x is any value between 0 and 255)
    • Subnet mask: Enter 255.255.255.0.
    • Leave all other fields empty.
    • Click OK.
  • Click OK.
  • Close Network Connections.
  • Restart the computer (if needed)

4.4 - Host File

For example:

10.10.10.10   gerardnico.local   gerardnico
#10.10.10.10   yourDNS.com   yourComputerName

4.5 - Testing

5 - Removing a Loopback Adapter

To remove a loopback adapter:

  • Display System in the Windows Control Panel.
  • In the Hardware tab, click Device Manager.
  • In the Device Manager window, expand Network adapters. You should see Microsoft Loopback Adapter.
  • Right-click Microsoft Loopback Adapter and select Uninstall.
  • Click OK.

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os/windows/loop_back_adaptater.txt · Last modified: 2017/05/06 11:05 by gerardnico