Examine the IP packet that carries the first ICMP Echo Request.Identify the IP address returned in the DNS response message.It is likely that these ICMP packets are preceded by a DNS query/response message pair. Examine the protocol column in the top pane of the Wireshark window.Protocol Analysis Questions To answer the following questions, start Wireshark and open the packet capture file created above. If the series of replies is very long, then you may wish to capture the replies in a text file by using the command: “tracert > ”. Save the contents in the Command Prompt window using a screen capture (Alt PrtSc).
Stop packet capture when Command Prompt returns. You should obtain a series of replies as shown in Figure 2.27 in the textbook.Ħ. (In Windows XP, from the “All Programs” Menu, select “Accessories” and then “Command Prompt”). You should obtain a series of replies as shown in Figure 2.26 in the textbook. For example, in Windows XP, start “Help and Support”, then enter “ping” or “tracert” in the search window and press Enter. PING, Traceroute commands: Consult your system documentation for information on using these commands. IP Time-to-Live PING application Traceroute applicationīackground Material Textbook pages: Chapter 4 (pages 163 - 166). ICMP: Echo, Echo Reply, Time Exceeded messages. Traceroute uses ICMP to allow users to determine the route that an IP packet takes from a local host to a remote host. PING uses ICMP to determine whether a host is reachable: 2. Wireshark Exercise 2 Probing the Internet (ICMP, PING, Traceroute) Objective In this exercise we investigate two applications of the Internet Control Message Protocol (ICMP): 1.
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