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4. Need to come up with a method to avoid bad results for replicated servers.
Abnormal Cases:
Satellite Links
Hosts that are on satellite links have very large delays. They cannot be located using the RTTs from a set of landmarks. Usually they have RTTs > 500ms. Most of the Central Asian countries (including Afghanistan) and some African countries use satellite links. Data from hosts in Kazakhistan, Burundi, Madagascar, Uganda, Afghanistan and Nigeria can be found here. The three best Landmarks chosen gives an RTT greater than 500ms. If the RTT from the three best landmarks is greater than 500ms then our algorithm returns the host as satellite link and does not perform rilaterationtrilateration. This figure may be changed latter.
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Replicated Servers Servers
Trilateration VS Multilateration
Here is the data.