In the top Wireshark packet list pane, select the second ICMP packet, labeled Time-to-live exceeded.Tracert is performed through a series of ICMP Echo requests, varying the Time-To-Live (TTL) until the destination is found. Notice that the type is 8 (Echo (ping) request).
Expand Internet Control Message Protocol to view ICMP details.Notice that the time to live is set to 1. Expand Internet Protocol Version 4 to view IPv4 details.Notice that it is an Ethernet II / Internet Protocol Version 4 / Internet Control Message Protocol frame. Observe the packet details in the middle Wireshark packet details pane.Select the first ICMP packet, labeled Echo (ping) request.To view only ICMP traffic, type icmp (lower case) in the Filter box and press Enter. Look for traffic with ICMP listed as the protocol. Observe the traffic captured in the top Wireshark packet list pane.When the trace is complete, close the command prompt.Īctivity 2 - Analyze Tracert Traffic.The -d option prevents DNS name resolution, which in this case will improve performance and reduce the amount of captured traffic. Type tracert -d 8.8.8.8 and press Enter to trace the route to one of Google's public DNS servers.Wikipedia: Internet Control Message ProtocolĪctivity 1 - Capture Tracert Traffic.Tracing routes is accomplished through the use of Internet Control Message Protocol (ICMP) Time Exceeded. These activities will show you how to use Wireshark to capture and analyze tracert/traceroute traffic. Wireshark is a free and open source packet analyzer used for network troubleshooting and analysis.
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