Question 8 [10 Marks]. Describe how traceroute finds the route from a source to a destination based on ICMP.
Added by Jonathan A.
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It sets a starting Time to Live (TTL) value, typically starting at 1. Show more…
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What is the difference between Ping and Traceroute? Describe how traceroute works by using ICMP messages. I'm looking for the second part of the question.
Madhur L.
7. Which fields in the IP datagram always change from one datagram to the next within this series of UDP segments sent by your computer destined to 128.119.245.12, via traceroute? Why? 8. Which fields in this sequence of IP datagrams (containing UDP segments) stay constant? Why? 9. Describe the pattern you see in the values in the Identification field of the IP datagrams being sent by your computer. Now let's take a look at the ICMP packets being returned to your computer by the intervening routers where the TTL value was decremented to zero (and hence caused the ICMP error message to be returned to your computer). The display filter that you can use to show just these packets is "ip.dst==192.168.86.61 and icmp". 10. What is the upper layer protocol specified in the IP datagrams returned from the routers? [Note: the answers for Linux/MacOS differ from Windows here]. 11. Are the values in the Identification fields (across the sequence of all ICMP packets from all routers) similar in behavior to your answer to question 9 above? 12. Are the values of the TTL fields similar across all ICMP packets from all routers?
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