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Looking at the long term minimum RTT from SLAC to Bangaldesh Bangladesh seen below it is apparent that the connection switched from using geostationary satellites (>450ms) to terrestrial connections (< 450ms) in 2006.
Looking in more detail at the minimum RTTs from SLAC to Bangladesh see the plot below showing the cut-over for the RU university in October 2006.
Jitter
This is typically an edge effect.
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How direct the route is between a source (monitor) and destination (monitored/remote) site is given by the directivity index. A value of 1.0 indicates that the route is a great circle route between the sites. Smaller values indicate the route is less direct. It is seen that the routes between Daffodil and North America and Latin America are the most direct with values of 0.42 and 0.45. Other routes are more indirect, with the route to South Asia being the least direct.
Next we look Looking in a bit more detail at the route from Daffodil to S. Asia connections between Daffodil and S. Asia we find:
- The one country with a reasonable Directivity (0.25) with Daffodil is Sri Lanka.
- The minimum RTT to Afghanistan is ~ 650msec indicating is probably connected via a geo stationary satellite link.
- Since the traceroute server at Daffodil is not working instead we look at the reverse routes to Daffodil from Pakistan. The route from Pakistan to Daffodil actually goes from Pakistan to Europe and then back to Singapore and Bangladesh hence accounting for the low value of Directivity. A similar result is seen for the route from Pakisan to Duet
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Round Trip times in Bangladesh
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