What Is It In The Segment That Identifies The Segment As A Syn Segment?

 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? To answer this question, it’s probably easiest to select an HTTP message and explore the details of the TCP packet used to carry this HTTP message, using the “details of the selected packet header window” (refer to Figure 2 in the “Getting Started with Wireshark” Lab if you’re uncertain about the Wireshark windows.

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IP address 192.168.1.5

TCP port: 1514

 

 

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?

IP address: 128.119.245.12

TCP port: 60

3. What is the IP address and TCP port number used by your client computer

(source) to transfer the file to gaia.cs.umass.edu?

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IP addresses and TCP port numbers

4. 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?

It is used to initiate the TCP connection and the value is 0. The SYN flag identifies it as a SYN segment and its set to 0.

 

5. 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? How did gaia.cs.umass.edu determine that value? What is it in the segment that identifies the segment as a SYNACK segment?

The sequence number of SYNACK segment has the value of 0, not set.

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6. What is the sequence number of the TCP segment containing the HTTP POST

command? Note that in order to find the POST command, you’ll need to dig into

the packet content field at the bottom of the Wireshark window, looking for a

segment with a “POST” within its DATA field.

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Has the value of 1.

7. Consider the TCP segment containing the HTTP POST as the first segment in the TCP connection. What are the sequence numbers of the first six segments in the TCP connection (including the segment containing the HTTP POST)? At what

time was each segment sent? When was the ACK for each segment received?

Given the difference between when each TCP segment was sent, and when its

acknowledgement was received, what is the RTT value for each of the six

segments? What is the EstimatedRTT value?

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8. What is the length of each of the first six TCP segments?

The first was 565bytes, then the rest were 1460 bytes.

 

 

9. What is the minimum amount of available buffer space advertised at the received for the entire trace? Does the lack of receiver buffer space ever throttle the sender?

minimum is 5840 bytes, but this will grow till a max of 62000 bytes.

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10. Are there any retransmitted segments in the trace file? What did you check for (in the trace) in order to answer this question?

No, there were no retransmitted segments. You can check by checking sequence numbers of TCP segments in trace file.

 

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11. How much data does the receiver typically acknowledge in an ACK? Can you

identify cases where the receiver is ACKing every other received segment?

 

12. What is the throughput (bytes transferred per unit time) for the TCP connection?

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