Autentication !!!

I have to customise Knoppix in such a way that user logging on Knoppix CD should be authenticated by Linux Server in the network.
I know the IP of Linux Server and its static.
So do I need to mount whole /etc of Server to local Knoppix user or a link will work. I tried both way, but mounting /etc took long time and I was unable to create link. Is there any way to create link of network directory?
Moreover how do I get loggin screen ??
I m in deep trouble plz help out??

Thanking You in advance...