What information in the IP header indicates that this is not the first datagram fragment? Are the more fragments? How can you tell? Print out the second 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? Print out the first fragment of the fragmented IP datagram. Has that message been fragmented across more than one IP datagram? TTL didn't change, but Identification changed.įind the first ICMP Echo Request message that was sent by your computer after you changed the Packet Size in pingplotter to be 2000. What is the value in the Identification field and the TTL field?ĭo these values remain unchanged for all of the ICMP TTL-exceeded replies sent to your computer by the nearest (first hop) router? Why? Which fields stay constant? Which of the fields must stay constant? Which fields must change? Why?Ĭonstant: Version, Header Length, Protocol.ĭescribe the pattern you see in the values in the Identification field of the IP datagram. Which fields in the IP datagram always change from one datagram to the next within this series of ICMP messages sent by your computer? Has this IP datagram been fragmented? Explain how you determined whether or not the datagram has been fragmented. 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.Ģ0 bytes. Within the IP packet header, what is the value in the upper layer protocol field?
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