计算机网络实验课 Lab5_Wireshark_IP
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Lab5 IP
Outline
• IP Datagram
• Experimental Procedures • Questions
IP Datagram
Experimental Procedures(windows)
• Step 1: Start Wireshark. • Step 2: Start Pingplotter
• 实验报告中的IP地址不能一样
• 截图后请配上文字说明 举例: The IP address of my computer：172.18.63.180
Thank you!
• Enter address: • Set packet size as 56, press Trace.
• Step 3: Pingplotter
• set packet size as 2000 • press Resume.
• Step 4: Pingplotter
• set packet size as 3500, • press Resume.
• Step 5: Stop Wireshark. • Step 6: Analysis the captured result
and answer the following questions.
Select the first ICMP Echo Request message
• 12. Print out the second fragment of the fragmented IP datagram. What information in the IP header indicates that this is not the first datagram fragment? Are the more fragments? How can you tell? (答案请截图，10分)
• 9. Do these valr all of the ICMP TTLexceeded replies sent to your computer by the nearest (first hop) router? Why? (10分)
Find the first ICMP Echo Request message
(Packet Size in pingplotter is 2000)
• 10. Has that message been fragmented across more than one IP datagram? (答案请截图说明，5分)
• 11. Print out the first fragment of the fragmented IP datagram. What information in the IP header indicates that the datagram been fragmented? What information in the IP header indicates whether this is the first fragment versus a latter fragment? How long is this IP datagram? (此题有三小问，答案请截图，10分)
Check ICMP messages
(ICMP TTL-exceeded replies by the nearest (first hop) router)
• 8. What is the value in the Identification field and the TTL field? (答案请截图，5分)
(打开IP协议部分)
• 1. What is the IP address of your computer? (答案请截图，5分)
• 2. Within the IP packet header, what is the value in the upper layer protocol field? (答案请截图，5分)
• 4. Has this IP datagram been fragmented? Explain how you determined whether or not the datagram has been fragmented. (答案请截图，5分)
Check ICMP messages
• 5. Which fields in the IP datagram always change from one datagram to the next within this series of ICMP messages sent by your computer? (5分)
• 6. Which fields stay constant? Which of the fields must stay constant? Which fields must change? Why? (10分)
• 7. Describe the pattern you see in the values in the Identification field of the IP datagram. (答案请截图说明，10分)
• 3. How many bytes are in the IP header? How many bytes are in the payload of the IP datagram? Explain how you determined the number of payload bytes. (答案请截图，5分)
• 13. What fields change in the IP header between the first and second fragment? (答案请截图， 5分)
Find the first ICMP Echo Request message
(Packet Size in pingplotter is 3500)
• 14. How many fragments were created from the original datagram? (答案请截图说明，5分)
• 15. What fields change in the IP header among the fragments? (5分)
Attentions
Outline
• IP Datagram
• Experimental Procedures • Questions
IP Datagram
Experimental Procedures(windows)
• Step 1: Start Wireshark. • Step 2: Start Pingplotter
• 实验报告中的IP地址不能一样
• 截图后请配上文字说明 举例: The IP address of my computer：172.18.63.180
Thank you!
• Enter address: • Set packet size as 56, press Trace.
• Step 3: Pingplotter
• set packet size as 2000 • press Resume.
• Step 4: Pingplotter
• set packet size as 3500, • press Resume.
• Step 5: Stop Wireshark. • Step 6: Analysis the captured result
and answer the following questions.
Select the first ICMP Echo Request message
• 12. Print out the second fragment of the fragmented IP datagram. What information in the IP header indicates that this is not the first datagram fragment? Are the more fragments? How can you tell? (答案请截图，10分)
• 9. Do these valr all of the ICMP TTLexceeded replies sent to your computer by the nearest (first hop) router? Why? (10分)
Find the first ICMP Echo Request message
(Packet Size in pingplotter is 2000)
• 10. Has that message been fragmented across more than one IP datagram? (答案请截图说明，5分)
• 11. Print out the first fragment of the fragmented IP datagram. What information in the IP header indicates that the datagram been fragmented? What information in the IP header indicates whether this is the first fragment versus a latter fragment? How long is this IP datagram? (此题有三小问，答案请截图，10分)
Check ICMP messages
(ICMP TTL-exceeded replies by the nearest (first hop) router)
• 8. What is the value in the Identification field and the TTL field? (答案请截图，5分)
(打开IP协议部分)
• 1. What is the IP address of your computer? (答案请截图，5分)
• 2. Within the IP packet header, what is the value in the upper layer protocol field? (答案请截图，5分)
• 4. Has this IP datagram been fragmented? Explain how you determined whether or not the datagram has been fragmented. (答案请截图，5分)
Check ICMP messages
• 5. Which fields in the IP datagram always change from one datagram to the next within this series of ICMP messages sent by your computer? (5分)
• 6. Which fields stay constant? Which of the fields must stay constant? Which fields must change? Why? (10分)
• 7. Describe the pattern you see in the values in the Identification field of the IP datagram. (答案请截图说明，10分)
• 3. How many bytes are in the IP header? How many bytes are in the payload of the IP datagram? Explain how you determined the number of payload bytes. (答案请截图，5分)
• 13. What fields change in the IP header between the first and second fragment? (答案请截图， 5分)
Find the first ICMP Echo Request message
(Packet Size in pingplotter is 3500)
• 14. How many fragments were created from the original datagram? (答案请截图说明，5分)
• 15. What fields change in the IP header among the fragments? (5分)
Attentions