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Unformatted text preview: /D|/Documents%20and%20Settings/bigini/Docu...homenet2run/tcpip/tcp-ip-illustrated/introduc.htm (15 of 20) [12/09/2001 14.46.31] Chapter 1. Introduction In Sections 1.4 and 1.9 we talked about the worldwide Internet and the need to allocate IP
addresses centrally (the InterNIC) and the well-known port numbers (the IANA). The word
internet means different things depending on whether it's capitalized or not.
The lowercase internet means multiple networks connected together, using a common protocol
suite. The uppercase Internet refers to the collection of hosts (over one million) around the world
that can communicate with each other using TCP/IP. While the Internet is an internet, the
reverse is not true. 1.14 Implementations
The de facto standard for TCP/IP implementations is the one from the Computer Systems
Research Group at the University of California at Berkeley. Historically this has been distributed
with the 4.x BSD system (Berkeley Software Distribution), and with the "BSD Networking
Releases." This source code has been the starting point for many other implementations.
Figure 1.10 shows a chronology of the various BSD releases, indicating the important TCP/IP
features. The BSD Networking Releases shown on the left side are publicly available source
code releases containing all of the networking code: both the protocols themselves and many of
the applications and utilities (such as Telnet and FTP).
Throughout the text we'll use the term Berkeley-derived implementation to refer to vendor
implementations such as SunOS 4.x, SVR4, and AIX 3.2 that were originally developed from
the Berkeley sources. These implementations have much in common, often including the same
bugs! file:///D|/Documents%20and%20Settings/bigini/Docu...homenet2run/tcpip/tcp-ip-illustrated/introduc.htm (16 of 20) [12/09/2001 14.46.31] Chapter 1. Introduction Figure 1.10 Various BSD releases with important TCP/IP features.
Much of the original research in the Internet is still being applied to the Berkeley...
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