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CL 307 NUCES Computer Networks Lab Report II

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Subject
Computer Science
School
National University of Computer and Emerging Sciences
Type
Lab Report
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National University of Computer and Emerging Sciences
Laboratory Manuals
for
Computer Networks
(CL -307)
Course Instructor
Mr. Ibrahim Nadir
Lab Instructor(s)
Umer Shafqat
Salman Shoaib
Section
CS-6E
Semester
Spring 2020
Department of Computer Science
FAST-NU, Lahore, Pakistan

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Lab Manual 08
Objective:
Observing the structure and working of TCP, UDP and ICMP Protocols in Wireshark.
Lab Statement 1: Analyzing TCP Packets using Wireshark (10)
Step 1: Run Wireshark.
Step 2: Load the trace file tcp-ethereal-trace-1
Step 3: Now filter out all TCP packets by typing “tcp” (without quotes) in the filter field
towards the top of the Wireshark window. You should see a series of TCP and HTTP
messages between the host in MIT and gaia.cs.umass.edu. The first three packets of the
trace consist of the initial three-way handshake containing the SYN, SYN ACK and ACK
messages. You should see a series of “TCP Segment of Reassembled PDU” messages
being sent from the host in MIT to gaia.cs.umass.edu. Recall from the previous lab that
there is no such thing as an HTTP Continuation message this is Wireshark’s way of
indicating that there are multiple segments being used to carry a single HTTP message.
You should also see TCP ACK segments being returned from gaia.cs.umass.edu to the host
in MIT.
Question 1: What is the IP address and TCP port number used by the client computer
(source) that is transferring the file to gaia.cs.umass.edu?
Here Source IP is 192.169.1.102 and source port is 1161
Question 2: What is the IP address of gaia.cs.umass.edu? On what port number is it
sending and receiving TCP segments for this connection?
Here IP of gaia.cs.umass.edu is 128.119.245.12 and it is using port # 80 for sending and
receiving data.

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National University of Computer and Emerging Sciences Laboratory Manuals for Computer Networks (CL -307) Course Instructor Mr. Ibrahim Nadir Lab Instructor(s) Umer Shafqat Salman Shoaib CS-6E Spring 2020 Section Semester Department of Computer Science FAST-NU, Lahore, Pakistan Lab Manual 08 Objective: • Observing the structure and working of TCP, UDP and ICMP Protocols in Wireshark. Lab Statement 1: Analyzing TCP Packets using Wireshark (10) • • Step 1: Run Wireshark. Step 2: Load the trace file tcp-ethereal-trace-1 • Step 3: Now filter out all TCP packets by typing “tcp” (without quotes) in the filter field towards the top of the Wireshark window. You should see a series of TCP and HTTP messages between the host in MIT and gaia.cs.umass.edu. The first three packets of the trace consist of the initial three-way handshake containing the SYN, SYN ACK and ACK messages. You should see a series of “TCP Segment of Reassembled PDU” messages being sent from the host in MIT to gaia.cs.umass.edu. Recall from the previous lab that there is no such thing as an HTTP Continuation message – this is Wireshark’s way of indicating that there are multiple segments being used to carry a single HTTP message. You should also see TCP ACK segments being returned from gaia.cs.umass.edu to the host in MIT. Question 1: What is the IP address and TCP port number used by the client computer (source) that is transferring the file to gaia.cs.umass.edu? Here Source IP is ...
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