Can we have more than one loopback interfaces in Mac OS X?  which IOKit class we need to derive inorder to write driver to get loopback interface lo1.

Help me..

Let me append this info for future reference:
http://discussions.apple.com/message.jspa?messageID=6978539
copy from there:
1. Reset Open Firmware. As you turn on the machine, press & hold CmdOption+OF until you get a screen that says "Welcome to Open Firmware". At the prompt, enter "reset-nvram" (without the quotes). Press return. Enter "reset-all". Press return and the machine will restart.
2. Open network preferences. In airport, go to advanced. Check the box that says disconnect the wireless network when logging out. (It seems incredible that it would work, but apparently it sometimes does.)
3. Restart in "Safe" mode (hold down "Shift" while restarting). Once in Safe mode simply restart again in regular mode. http://docs.info.apple.com/article.html?artnum=306879
4. Go into your keychain and find the password key for your network. If you connect to a WAP it will be the name of that WAP. Then in the key click on the access control tab. It probably shows selected applications. Change this to "Allow all applications to access this item".
5. (The following apparently works temporarily, but it is not very clean. I would not recommend it except as a last resort.) Remove all the files and folders from the non-user Library/Preferences folder and reboot.

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