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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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TCP/IP Addressing

To understand networking with Linux, you need to know the basics of TCP/IP addressing. Internet IP addresses (also known as public IP addresses) are different from those used internally on a local area network (LAN). Internet IP addresses are assigned (for the United States and some other hosts) by the American Registry for Internet Numbers, available at www.arin.net/. Entities that need an Internet address apply to this agency to be assigned an address. The agency assigns Internet service providers (ISPs) one or more blocks of IP addresses, which the ISPs can then assign to their subscribers.

You will quickly recognize the current form of TCP/IP addressing, known as IP version 4 (IPv4). In this method, a TCP/IP address is expressed ...

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