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Douglas E. Comer
Computer Science Department
Purdue University
West Lafayette, IN 47907
webmaster: W. David Laverell
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HON: Faculty Notes to Chapter 15
Home > Faculty > Chapter Notes > Chapter 15
Chapter 15
Chapter 15 requires a "Dedicated Intranet Lab".
The failure of the "dot coms" carried with it a silver lining
for educational institutions in the presence of a lot of
inexpensive, used hardware. Calvin was able to purchase
eight Cisco 1605R routers with version 12.0(5T) of their
operating system for $5400. One needs to be very careful when
purchasing routers because many of them do not have the
interfaces that allow the kinds of connections contemplated
in these experiments. (I must admit to coming very close to
what would have been a disastrous purchase. Check with your
network people to be sure.) The 1605R is ideal because it has
two ethernet interfaces.
We purchased eight 5 port switches at the local Best Buy. Switches
allow the hosts to be connected according to the various diagrams in
this chapter.
Our department's lab manager/sys admin, Gary Draving, and I were
able to set up an intranet in a remarkably short time.
We grouped 25 LINUX boxes into 8 workgroups each with its own
router and switch. The usual configuration has each router
connected to a central switch. We assigned ip addresses
according to a simple scheme. Host n in subnet m was given the
address 10.2.m.n. The ethernet 0 interface on each router was
given the address 10.2.m.30, while ethernet 1 received
10.2.m.5. This turned out to be a felicitous choice when we
tackled Experiment 17.4.
Simplified directions
for some of the tasks involved in the experiments in this
chapter may be found on the notes in
the student section.
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