Two computers are connected over medium of your choice, say, ethernet/ wifi (using nullmodem/ cross cable or through a switch/ hub).

Assignment # 3
Course Sysadmin F-2020
Weight: 3 % of your total grade
Due date: Thursday 21st January
Scenario:
Two computers are connected over medium of your choice, say, ethernet/ wifi (using
nullmodem/ cross cable or through a switch/ hub). Suppose you need to troubleshoot the link
for observed anomalies. Best strategy is to trace the packets being sent over the medium and
analyze the packet contents. TCPDUMP (lower case of course) command is the tool of
choice offering a wide variety of options. We discussed the important ones earlier today
during the lecture.
Your job is to:
1: Set up the described scenario as per following diagram
2: Trace ICMP messages (ping) and look for packet contents/ various flags in ICMP request/
response packets
3: Present your results in the form of a short write up or a 3-5 slide presentation/ pdf etc… Plz
also include the screengrabs of the same.
3: TCPDUMP Manpage, info page and google are your trusted friends!
4: Extra points for those who attempt to write a script which inputs source and destination Ips,
and ping count and then presents the results neatly formatted 🙂 Even if the script is not
complete/ functioning, but you can logically convince me what you were tring to get at (say in
pseudo code) your effort will be appreciated/ awarded.
Computer A & B communicating over wifi
ICMP Echo_Request
ICMP Echo_Response
SysAdmins
:
“hmm, let us tap
into the wire and
see what is going on the wire/ wifi interface” Ready our tcpdump filter we can find out the root
cause!”
Goodluck!
F

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