1. Start up your web browser and go to the http://gaia.cs.umass.edu/wireshark-labs/alice.txt and
retrieve an ASCII copy of Alice in Wonderland. Store this file somewhere on your computer
2. Next go to http://gaia.cs.umass.edu/wireshark-labs/TCP-wireshark-file1.html. You will
find a form to upload the text file.
3. Use the browse button in this form to enter the name of the file on your computer containing
Alice in Wonderland. Don’t yet press the “Upload alice.txt file” button in the form
4. Now start up Wireshark and begin packet capture.
5. Returning to your browser press the “Upload alice.txt file” button in the form to upload the
file to the gaia.cs.umass.edu server. Once the file has been uploaded, a short congratulations
message will be displayed in your browser window.
6. Stop the Wireshark packet capture
Answer the following questions:
1. What is the IP address and TCP port number used by client computer (source) that is
transferring the file to gaia.cs.umass.edu?
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?
3. What is the sequence number of the TCP SYN segment that is used to initiate the TCP
connection between the client computer and gaia.cs.umass.edu? What is it in the segment that
identifies the segment as a SYN segment?
4. What is the sequence number of the SYNACK segment sent by gaia.cs.umass.edu to the
client computer in reply to the SYN? What is the value of the Acknowledgement field in the
SYNACK segment? What is it in the segment that identifies the segment as a SYNACK
segment?
5. What is the sequence number of the TCP segment containing HTTP POST command?
Hints: In order to find the POST command, you will need to dig into the packet content field
at the bottom of the wireshark window
6. What are the sequence numbers of the first six TCP segments? Consider the TCP segment
that contains HTTP POST as the first segment in the TCP connection.
7. When the acknowledgement for the first TCP segment received? What is the
acknowledgement number for that acknowledgement? Calculate the RTT value to get this
acknowledgement.
8. What is the length of each of the first six TCP segments?
Plot the following graph:
Select a TCP segment in the Wireshark’s “listing of captured-packets” window. Then select
the menu: Statistics-> TCP Stream Graph -> Time-Sequence-Graph(Stevens). Make a plot
that looks similar to the plot given in part 4 of the “Wireshark_TCP_v8.0.pdf” file uploaded
in the course content section of Blackboard
Question 9: In the graph each dot represents a TCP segment sent. What is meant by a set of
dots stacked above each other in the graph?
$Do the following: 1. Start up your web browser and go to the http://gaia.cs.umass.edu/wireshark-labs/alice.txt and retrieve an ASCII copy of Alice in Wonderland. Store this file somewhere on your computer 2. Next go to http://gaia.cs.umass.edu/wireshark-labs/TCP-wireshark-file1.html. You will find a form to upload the text file. 3. Use the browse button in this form to enter the name of the file on your computer containing Alice in Wonderland. Don't yet press the "Upload alice.txt file" button in the form 4. Now start up Wireshark and begin packet capture. 5. Returning to your browser press the "Upload alice.txt file" button in the form to upload the file to the gaia.cs.umass.edu server. Once the file has been uploaded, a short congratulations message will be displayed in your browser window. 6. Stop the Wireshark packet capture Answer the following questions: 1. What is the IP address and TCP port niimher ised hy elient eompiiter (souree) that is transferring the file to gaia.cs.umass.edu? 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? 3. What is the sequence number of the TCP SYN segment that is used to initiate the TCP connection between the client computer and gaia.cs.umass.edu? What is it in the segment that identifies the segment as a SYN segment? 4. What is the sequence number of the SYNACK segment sent by gaia.es.umass.edu to the clhent computer in reply to the SYN? What is the value of the Acknowledgement field in the SYNACK segment? What is it in the segment that identifies the segment as a SYNACK segment? 5. What is the sequence number of the TCP segment containing HTTP POST command? Hints: In order to find the POST command, you will need to dig into the packet content field at the bottom of the wireshark window 0000 e0 ed es 80 la d7 ce b5 d7 03 Ja 35 00 00 4s 00 8010 82 ee 5d aa 48 00 80 86 64 2e ce a8 80 05 80 77 f5 ec d7 56 00 50 bc ce 2c 3d 22 e7 74 6e 50 18 53 54 20 2f 77 69 72 65 62 73 2f 6c 61 62 33 2d 68 74 6d 20 48 54 54 50 :5- E d. "- tnP {. (PO ST /wire shark-la bs/lab3- 1-reply. htm HTTP 0060 2f 31 2e 31 od ea 48 6f 73 74 3a 20 67 61 69 61 /1.1. Ho st: gaia .cs.umas s.edu. C e020 ..V.P 02 01 7b 1f 00 00 50 4f 73 68 61 72 6b 2d 6c 61 e050 31 2d 72 65 70 6c 79 2e 0030 0040 0070 2e 63 73 2e 75 6d 61 73 73 2e 65 64 75 ed ea 43 6. What are the sequence numbers of the first six TCP segments? Consider the TCP segment that contains HTTP POST as the first segment in the TCP connection 7. When the acknowledgement for the first TCP segment received? What is the acknowledgement number for that acknowledgement? Calculate the RTT value to get this acknowledgement. 8. What is the length of each of the first six TCP segments? Plot the following graph: Select a TCP segment in the Wireshark's "listing of captured-packets" window. Then select the menu: Statistics-> TCP Stream Graph -> Time-Sequence-Graph(Stevens). Make a plot that looks similar to the plot given in part 4 of the “Wireshark_TCP_v8.0.pdf" file uploaded in the course content section of Blackboard Question 9: In the graph each dot represents a TCP segment sent. What is meant by a set of dots stacked above each other in the graph?$
Transcribed Image Text:Do the following: 1. Start up your web browser and go to the http://gaia.cs.umass.edu/wireshark-labs/alice.txt and retrieve an ASCII copy of Alice in Wonderland. Store this file somewhere on your computer 2. Next go to http://gaia.cs.umass.edu/wireshark-labs/TCP-wireshark-file1.html. You will find a form to upload the text file. 3. Use the browse button in this form to enter the name of the file on your computer containing Alice in Wonderland. Don't yet press the "Upload alice.txt file" button in the form 4. Now start up Wireshark and begin packet capture. 5. Returning to your browser press the "Upload alice.txt file" button in the form to upload the file to the gaia.cs.umass.edu server. Once the file has been uploaded, a short congratulations message will be displayed in your browser window. 6. Stop the Wireshark packet capture Answer the following questions: 1. What is the IP address and TCP port niimher ised hy elient eompiiter (souree) that is transferring the file to gaia.cs.umass.edu? 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? 3. What is the sequence number of the TCP SYN segment that is used to initiate the TCP connection between the client computer and gaia.cs.umass.edu? What is it in the segment that identifies the segment as a SYN segment? 4. What is the sequence number of the SYNACK segment sent by gaia.es.umass.edu to the clhent computer in reply to the SYN? What is the value of the Acknowledgement field in the SYNACK segment? What is it in the segment that identifies the segment as a SYNACK segment? 5. What is the sequence number of the TCP segment containing HTTP POST command? Hints: In order to find the POST command, you will need to dig into the packet content field at the bottom of the wireshark window 0000 e0 ed es 80 la d7 ce b5 d7 03 Ja 35 00 00 4s 00 8010 82 ee 5d aa 48 00 80 86 64 2e ce a8 80 05 80 77 f5 ec d7 56 00 50 bc ce 2c 3d 22 e7 74 6e 50 18 53 54 20 2f 77 69 72 65 62 73 2f 6c 61 62 33 2d 68 74 6d 20 48 54 54 50 :5- E d. "- tnP {. (PO ST /wire shark-la bs/lab3- 1-reply. htm HTTP 0060 2f 31 2e 31 od ea 48 6f 73 74 3a 20 67 61 69 61 /1.1. Ho st: gaia .cs.umas s.edu. C e020 ..V.P 02 01 7b 1f 00 00 50 4f 73 68 61 72 6b 2d 6c 61 e050 31 2d 72 65 70 6c 79 2e 0030 0040 0070 2e 63 73 2e 75 6d 61 73 73 2e 65 64 75 ed ea 43 6. What are the sequence numbers of the first six TCP segments? Consider the TCP segment that contains HTTP POST as the first segment in the TCP connection 7. When the acknowledgement for the first TCP segment received? What is the acknowledgement number for that acknowledgement? Calculate the RTT value to get this acknowledgement. 8. What is the length of each of the first six TCP segments? Plot the following graph: Select a TCP segment in the Wireshark's "listing of captured-packets" window. Then select the menu: Statistics-> TCP Stream Graph -> Time-Sequence-Graph(Stevens). Make a plot that looks similar to the plot given in part 4 of the “Wireshark_TCP_v8.0.pdf" file uploaded in the course content section of Blackboard Question 9: In the graph each dot represents a TCP segment sent. What is meant by a set of dots stacked above each other in the graph?

Question

1. Start up your web browser and go to the http://gaia.cs.umass.edu/wireshark-labs/alice.txt and
retrieve an ASCII copy of Alice in Wonderland. Store this file somewhere on your computer
2. Next go to http://gaia.cs.umass.edu/wireshark-labs/TCP-wireshark-file1.html. You will
find a form to upload the text file.
3. Use the browse button in this form to enter the name of the file on your computer containing
Alice in Wonderland. Don’t yet press the “Upload alice.txt file” button in the form
4. Now start up Wireshark and begin packet capture.
5. Returning to your browser press the “Upload alice.txt file” button in the form to upload the
file to the gaia.cs.umass.edu server. Once the file has been uploaded, a short congratulations
message will be displayed in your browser window.
6. Stop the Wireshark packet capture
Answer the following questions:
1. What is the IP address and TCP port number used by client computer (source) that is
transferring the file to gaia.cs.umass.edu?
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?
3. What is the sequence number of the TCP SYN segment that is used to initiate the TCP
connection between the client computer and gaia.cs.umass.edu? What is it in the segment that
identifies the segment as a SYN segment?
4. What is the sequence number of the SYNACK segment sent by gaia.cs.umass.edu to the
client computer in reply to the SYN? What is the value of the Acknowledgement field in the
SYNACK segment? What is it in the segment that identifies the segment as a SYNACK
segment?
5. What is the sequence number of the TCP segment containing HTTP POST command?
Hints: In order to find the POST command, you will need to dig into the packet content field
at the bottom of the wireshark window
6. What are the sequence numbers of the first six TCP segments? Consider the TCP segment
that contains HTTP POST as the first segment in the TCP connection.
7. When the acknowledgement for the first TCP segment received? What is the
acknowledgement number for that acknowledgement? Calculate the RTT value to get this
acknowledgement.
8. What is the length of each of the first six TCP segments?
Plot the following graph:
Select a TCP segment in the Wireshark’s “listing of captured-packets” window. Then select
the menu: Statistics-> TCP Stream Graph -> Time-Sequence-Graph(Stevens). Make a plot
that looks similar to the plot given in part 4 of the “Wireshark_TCP_v8.0.pdf” file uploaded
in the course content section of Blackboard
Question 9: In the graph each dot represents a TCP segment sent. What is meant by a set of
dots stacked above each other in the graph?

Do the following:
1. Start up your web browser and go to the http://gaia.cs.umass.edu/wireshark-labs/alice.txt and
retrieve an ASCII copy of Alice in Wonderland. Store this file somewhere on your computer
2. Next go to http://gaia.cs.umass.edu/wireshark-labs/TCP-wireshark-file1.html. You will
find a form to upload the text file.
3. Use the browse button in this form to enter the name of the file on your computer containing
Alice in Wonderland. Don't yet press the "Upload alice.txt file" button in the form
4. Now start up Wireshark and begin packet capture.
5. Returning to your browser press the "Upload alice.txt file" button in the form to upload the
file to the gaia.cs.umass.edu server. Once the file has been uploaded, a short congratulations
message will be displayed in your browser window.
6. Stop the Wireshark packet capture
Answer the following questions:
1. What is the IP address and TCP port niimher ised hy elient eompiiter (souree) that is
transferring the file to gaia.cs.umass.edu?
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?
3. What is the sequence number of the TCP SYN segment that is used to initiate the TCP
connection between the client computer and gaia.cs.umass.edu? What is it in the segment that
identifies the segment as a SYN segment?
4. What is the sequence number of the SYNACK segment sent by gaia.es.umass.edu to the
clhent computer in reply to the SYN? What is the value of the Acknowledgement field in the
SYNACK segment? What is it in the segment that identifies the segment as a SYNACK
segment?
5. What is the sequence number of the TCP segment containing HTTP POST command?
Hints: In order to find the POST command, you will need to dig into the packet content field
at the bottom of the wireshark window
0000 e0 ed es 80 la d7 ce b5 d7 03 Ja 35 00 00 4s 00
8010 82 ee 5d aa 48 00 80 86 64 2e ce a8 80 05 80 77
f5 ec d7 56 00 50 bc ce 2c 3d 22 e7 74 6e 50 18
53 54 20 2f 77 69 72 65
62 73 2f 6c 61 62 33 2d
68 74 6d 20 48 54 54 50
:5- E
d.
"- tnP
{. (PO ST /wire
shark-la bs/lab3-
1-reply. htm HTTP
0060 2f 31 2e 31 od ea 48 6f 73 74 3a 20 67 61 69 61 /1.1. Ho st: gaia
.cs.umas s.edu. C
e020
..V.P
02 01 7b 1f 00 00 50 4f
73 68 61 72 6b 2d 6c 61
e050 31 2d 72 65 70 6c 79 2e
0030
0040
0070 2e 63 73 2e 75 6d 61 73 73 2e 65 64 75 ed ea 43
6. What are the sequence numbers of the first six TCP segments? Consider the TCP segment
that contains HTTP POST as the first segment in the TCP connection
7. When the acknowledgement for the first TCP segment received? What is the
acknowledgement number for that acknowledgement? Calculate the RTT value to get this
acknowledgement.
8. What is the length of each of the first six TCP segments?
Plot the following graph:
Select a TCP segment in the Wireshark's "listing of captured-packets" window. Then select
the menu: Statistics-> TCP Stream Graph -> Time-Sequence-Graph(Stevens). Make a plot
that looks similar to the plot given in part 4 of the “Wireshark_TCP_v8.0.pdf" file uploaded
in the course content section of Blackboard
Question 9: In the graph each dot represents a TCP segment sent. What is meant by a set of
dots stacked above each other in the graph?

Accepted Answer

Actually, TCP stands for Transmission Control Protocol.