Installing a Loopback Adapter on a DHCP host


Dynamic Host Configuration Protocol (DHCP) assigns dynamic IP addresses on a network. So each time the computer connects to the network, DHCP allows a computer to have a different IP address. But in some cases, like when installing Oracle Database or Oracle Business Intelligence, you need to assign a local IP address to that computer. And you have to install a loopback adapter to perform this task.

To install a loopback adapter on Windows XP the required steps are:

  • Open Windows Control Panel
  • Start Add Hardware wizard
  • Choose “Yes, I have already connected the hardware” when answering to the “Have you already connected this hardware to your computer?” question
  • From the hardware list installed on your computer choose “Add a new hardware device”

 Add Hardware Wizard

  • Choose “Install the hardware that I manually select from a list” when answering to the “What do you want the wizard to do?” question.
  • From the type of hardware types, choose Network adapters.

 Add Hardware Wizard

  • From the loopback adapters list, choose Microsoft Loopback Adapter.

Add Hardware Wizard

After the installation completes there are a few configuration steps:

  • Right click on My Network places, and then right-click on the new connection, usually named “Local Area Connection 2” and choose Properties.
  • Select Internet Protocol (TCP/IP) and click Properties
  • Enter a non-routable IP for the loopback adapter

Internet Protocl Properties

  • Add a line to the SYSTEM_DRIVE:\WINNT\system32\drivers\etc\hosts like:  mycomputer

  • Restart the computer.

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


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

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