1 Virtual Brewery and Virtual Winery { the two subnets.
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6.1 The named.boot le for vlager.
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6.2 The named.ca le.
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6.3 The named.hosts le.
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6.4 The named.local le.
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6.5 The named.rev le.
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7.1 A sample dip script
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9.1 A sample /etc/inetd.conf le.
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9.2 A sample /etc/rpc le.
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10.1 Sample nsswitch.conf le.
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12.1 Interaction of Taylor UUCP Conguration Files.
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13
14
LIST
OF
FIGURES
15.1 sendmail Support Files.
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15.2 A sample sendmail.m4 le for vstout.
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16.1 Usenet news ow through Groucho Marx University.
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17.1 News ow through relaynews.
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Preface
With the Internet much of a buzzword recently, and otherwise serious people joyriding
along the \Informational Superhighway," computer networking seems to be moving toward the status of TV sets and microwave ovens. The Internet is recently getting an unusually
high media coverage, and social science majors are descending on Usenet newsgroups to
conduct researches on the \Internet Culture." Carrier companies are working to introduce new transmission techniques like ATM that oer many times the bandwidth the average
network link of today has.
Of course, networking has been around for a long time. Connecting computers to form
local area networks has been common practice even at small installations, and so have been long-haul links using public telephone lines. A rapidly growing conglomerate of world-wide networks has, however, made joining the global village a viable option even for small non-prot organizations of private computer users. Setting up an Internet host with mail and
news capabilities oering dial-up access has become aordable, and the advent of ISDN will doubtlessly accelerate this trend.
Talking of computer networks quite frequently means talking about UNIX. Of course,
UNIX is neither the only operating system with network capabilities, nor will it remain a
front-runner forever, but it has been in the networking business for a long time, and will surely continue to do so for some time to come.
What makes it particularly interesting to private users is that there has been much
activity to bring free UNIXoid operating systems to the PC, being 386BSD, FreeBSD | and
Linux. However, Linux is not UNIX. That is a registered trademark of whoever currently
holds the rights to it (Univel, while I'm typing this), while Linux is an operating system that strives to oer all functionality the POSIX standards require for UNIX-like operating 15
Documentation on Linux
16
systems, but is a complete reimplementation.
The Linux kernel was written largely by Linus Torvalds, who started it as a project to
get to know the Intel i386, and to \make MINIX better." MINIX was then another popular PC operating system oering vital ingredients of
functionality, and was written by
un?x
Prof. Andrew S. Tanenbaum.
Linux is covered by the GNU General Public License (GPL), which allows free distribu-
tion of the code (please read the GPL in appendix C for a denition of what \free software"
means). Outgrowing its child's diseases, and drawing from a large and ever-growing base
of free application programs, it is quickly becoming the oprating system of choice for many PC owners. The kernel and C library have become that good that most standard software
may be compiled with no more eort than is required on any other mainstream
ish
un?x
system, and a broad assortment of packaged Linux distributions allows you to almost drop
it onto your hard disk and start playing.
Documentation on Linux