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Ubuntu Unleashed 2014 Edition: Covering 13.10 and 14.04,Ninth Edition by Paul Hudson, Andrew Hudson, Matthew Helmke

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Laying the Foundation: The localhost Interface

The first thing that needs to be in place before you can successfully connect to a network or even to the Internet is a localhost interface, sometimes called a loopback interface, but more commonly referenced as lo. The TCP/IP protocol (see the section “Networking with TCP/IP” later in this chapter) uses this interface to assign an IP address to your computer and is needed for Ubuntu to establish a PPP interface.

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