Transcript TCP/IP Laboratory

A TCP/IP Lab Course
Magda El Zarki
Dept. of ICS
UC, Irvine
[email protected]
Outline of Presentation
Acknowledgment
 Motivation
 Course Layout
 Lab Set Up
 Sample Experiment
 Conclusions
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Origin of this Course
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I would like to thank Professor Shivendran
Panwar and Jeong-dong Ryoo of the Dept.
of Elc. Eng. at Polytechnic University,
Brooklyn, NY, for giving us their lab notes
from their EL 537 course. The content for
this lab manual was derived from their lab
manual, the material has been modified to
reflect the laboratory set-up that we have at
UCI
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Motivation
Regular in class course -> in one ear
out the other
 Hands on lab experience hammers the
concepts in
 Students learn to extract the theories
taught in the regular course and apply it
to real situations
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Is it Working?
Course is very successful
 Teach it every quarter: senior Ugrads
and 1st yr Grads
 Have to cap the class size due to
resource limitations (equipment and lab
assistants)
 Students claim that they finally learnt
something!
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Course Layout
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10 weeks: 8 weeks of labs, 1 week midterm,
1 week course review, final exam
One lecture a week - 3hrs
Lecture consists of 2 parts:
– Overview of topic covered by lab, reference an
assigned text
– Demonstration of the experiment
We have installed in the lecture hall a similar setup as
the one used by the students
 Overhead projector enables professor to show actual
experiment set up and results/outputs
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Course Outline
Each Lab is on a specific topic and spans
a 2 week period -> part 1 and part 2,
reports are due for each part.
 Lab 1: Introduction
 Lab 2: Bridging
 Lab 3: Routers
 Lab 4: TCP and UDP
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Lab 1 - Objectives
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Read the following sections in the assigned text:…
Getting acquainted with the Linux and Xwindows
environment
Preview of some TCP/IP diagnostic tools
Capturing link/IP/TCP layer header
The usage of port numbers and IP protocol field
Subnetting
ARP
Configuring Interfaces
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Week 1: Introduction
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Discuss lab rules
Describe equipment and lab set up
Outline course requirements and grading:
– Weekly lab reports
– Midterm and Final
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Simple experiments to introduce them to
Linux and the monitoring and configuration
tools that they will use
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Sample Lab Rules
Work in groups of max. size 4. Indicate in your lab report for
the week who was in your group
 The lab is open and groups can work on their experiments at
any time
 All reports are due one week after your lab (beginning of
class). Each student in a group must submit his/her own
laboratory report
 You should read all pertinent chapters and bring the textbook
and a 3.5” floppy disk to each session of the laboratory
 Always check PC and router/bridge configurations, make no
assumptions as to their set-up.DO NOT turn of the PCs
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Equipment Description
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4 routers
4 hubs
4 PCs
1 switch box to share 1
monitor, 1 keyboard,
and 1 mouse
1 console
1 19” rack
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Monitoring Tools
Ethereal and tethereal: excellent
monitoring tools that have replaced
tcpdump
 netstat, ping, traceroute
 Understanding the packet headers
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Week 2: Configuring Interfaces
Using ifconfig
 Setting IP addresses and using subnet
masks
 Operation of ARP
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Lab 2: Data Link Layer - Bridging
Configuration of Bridges/Routers
 Simple Bridge Experiment
 Spanning Tree algorithm
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Lab 3: IP Layer - Routers & Routing
Static Routing
 RIP
 OSPF
 ICMP
 Mixed Bridge/Router experiment
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Lab 4: Transport Layer
The SOCK program
 UDP
 FTP and TFTP
 TCP
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Lab Set Up
The lab where the equipment is housed
is an open lab
 We have 5 - 19” racks with equipment
 Each rack is self contained
 Equipment is isolated
 Students must save data to floppies and
analyze and print data on other systems
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Picture of Lab Set Up
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Course Personnel
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One faculty member
One TA and 2 graders per 50 - 70 students
(recommended)
TA spends 9hrs a week in lab helping
students, each grader spends approx. 15hrs
grading a week.
Faculty member spends 3hrs a week in lab
Lab with 5 racks can handle approx. 65
students with open hours
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Flow of Experiments
Configuring the experiment
 Do a particular exercise
 Answer related questions
 More exercises and corresponding
questions
 Write report
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Configuring an Experiment
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A 4 Subnet Experiment
In this experiment, we divide the network into four subnets.
There will be one machine in each of the following subnets,
154.81.51.0, 154.81.52.0, 154.81.53.0 and 154.81.54.0. As
shown in figure 3.2, we will connect the four subnets
(154.81.51.0, 154.81.52.0, 154.81.53.0, and 154.81.54.0) using
three routers.
 In order to configure the new network topology, we need to
change the current IP addresses of each PC interface card. The
new IP addresses that we want to use are as shown in the
figure. (Note that 52.100 is an abbreviation for 154.81.52.100.
This notation applies to all the PC and router addresses given
in the figure above.)
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Configuration
53.10
0
154.81.53.0
Router3
Eth0:53.3
Eth1:54.3
154.81.51.0
Router2
Eth0: 53.2
Eth1: 52.2
Router1
Eth0:51.1
Eth1:52.1
154.81.52.0
154.81.54.0
54.100
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51.100
52.100
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Exercises:
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Change the IP addresses of the PCs to reflect the
network configuration as shown in the figure. Also
configure the routers. Save the output of netstat rn or route –ee before building the PCs’ routing
tables. After examining the figure, build the static
routing tables in all the PCs manually. Use netstat
–rn or route –ee to verify your entries.
Use the ping and traceroute programs to test the
connections. Save the traceroute outputs
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Questions and Report
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What is the subnet mask for this subnetted
network?
For each IP address that you assigned, identify the
subnet ID and the host ID.
Compare the contents of the four route outputs.
What do you observe? Discuss the different entries
and the corresponding flags.
Analyze the tethereal output and explain what
happens using the content of the tethereal file
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Conclusions:
A fun course to teach
 Self managed
 Very popular with students
 Co-authoring a self contained text with
Shiv Panwar and Jorg Liebherr,to
appear in 2002
 Will contain more labs to fill a semester
course
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