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Tracet Route Doubt

Posted on 2009-05-11
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Last Modified: 2012-05-06
When i do tracert,  some IPs are repeat two times, is it Loop?

thanks in Advance
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Question by:mastervk
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Frosty555 earned 50 total points
ID: 24361215
No. This is a phenomenon that is part of the way Tracert works.  

Because the internet is not a stable environment, packets sometimes take different routes to reach their destination. Since there's multiple possible ways that a packet can get from point A to point B, Tracert sends out lots of packets and averages out where they went, and displays the results to you.

Take a look at the picture.
    If a packet takes Route "A", it will hit the "GREEN" step on it's third hop.
    If the packet takes Route "B", it will hit the "GREEN" step on it's second hop.

Depending on how often these routes happen, tracert may display the "GREEN" step as both the second hop, AND The third hop, in the route for the packet.

tracert.jpg
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by:Frosty555
Frosty555 earned 50 total points
ID: 24361228
This occurs because TCP doesn't actually HAVE a means by which you can trace where a packet went. Tracert "fakes" it by sending out packets that have a limited number of hops they are allowed to take before they die, and get "returned to sender". The data that comes back gives Tracert and idea of where a packet ended up when it was only allowed to go one hop, then two, then three, etc. until it reaches its destination.

See this discussion:
http://www.lincoln.edu/math/rmyrick/ComputerNetworks/InetReference/54.htm
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