计算机网络wireshark抓包实验之ICMP，实验内容有下： 1.What is the IP address of your host? What is the IP address of the destination host? 2. Why is it that an ICMP packet does not have source and destination port numbers? 3.Examine one of the ping request packets sent by your host. What are the 3.ICMP type and code numbers? What other fields does this ICMP packet have? How many bytes are the checksum, sequence number and identifier fields?