Problem 3: Perform a Traceroute between source and destination on the same conti
ID: 3692562 • Letter: P
Question
Problem 3: Perform a Traceroute between source and destination on the same continent at three different hours of the day. a. Find the average and standard deviation of the round-trip delays at each of the three hours. b. Find the number of routers in the path at each of the three hours. Did the paths change during any of the hours? c. Try to identify the number of ISP networks that the Traceroute packets pass through from source to destination. Routers with similar names and/or similar IP addresses should be considered as part of the same ISP. In your experiments, do the largest delays occur at the peering interfaces between adjacent ISPs? d. Repeat the above for a source and destination on different continents. Compare the intra- continent and inter-continent results.
Explanation / Answer
On linux you can use the command
traceroute www.targethost.com
and in the Windows command prompt you can use
tracert www.targethost.com
In either case, you will get three delay measurements. For those three measurements you can calculate the mean and standard deviation. Repeat the experiment at different times of the day and comment on any changes.
Here is an example solution:
Traceroutes between www.poly.edu San Diego Super Computer Center and www.poly.edu
a) The average (mean) of the round-trip delays at each of the three hours is
71.18 ms, 71.38 ms and 71.55 ms, respectively. The standard deviations
are 0.075 ms, 0.21 ms, 0.05 ms, respectively.
b) In this example, the traceroutes have 12 routers in the path at each of
the three hours. No, the paths didn’t change during any of the hours.
c) Traceroute packets passed through four ISP networks from source to
destination. Yes, in this experiment the largest delays occurred at peering
interfaces between adjacent ISPs.
Traceroutes from www.stella-net.net (France) to www.poly.edu (USA).
d) The average round-trip delays at each of the three hours are 87.09 ms,
86.35 ms and 86.48 ms, respectively. The standard deviations are 0.53 ms,
0.18 ms, 0.23 ms, respectively. In this example, there are 11 routers in the
path at each of the three hours. No, the paths didn’t change during any of
the hours. Traceroute packets passed three ISP networks from source to
destination. Yes, in this experiment the largest delays occurred at peering
interfaces between adjacent ISPs.
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