want to add eth1 network interface to my system

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http://serverfault.com – First of all I have two virtual machines (Ubunutu 64-bit) running on Oracle VM Virtual Box. I am trying to install PPPoE server based on suggestions from this site guide to installing pppoe on ubuntu I am able to get a ppp connection and able to see packets over the ppp interface.However when the pppoe server is started my internet connection goes down.My /etc/network/interfaces file is given below.The script from the link above does edit this file. # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # (HowTos)