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The median value of alpha from England(Warrington) to Europe is 40.71 (km/ms). The IQR is 15.6 (km/ms) or IQR/Median~ 38% or ~ +-19%. The highest value of alpha 97.72 (km/ms) is due to a very small RTT (2.6ms) between (demon.co.uk) and this landmark which are 263 km apart.
The graph below shows the alpha distribution as seen from Italy to other European countries.
The median value of alpha from ICTP (Italy) to Europe is 18.91 (km/ms). The IQR is 10.98 (km/ms) or IQR/Median is ~58% or ~+-29.5%.
Conclusions
- Tiering can be used in N. America and Europe. ( Heuristics can be derived from this analysis which will narrow down the region of a particular host)
- The Great Circle distance and the path which the packets fallow may be different.
- The hosts which are near the landmark may have very high values of alpha.
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\[1\] A region may be different then a geographical region |
Choosing tier=0 landmarks
Look at the analyzed logs using http://www-wanmon.slac.stanford.edu/cgi-wrap/reflector.cgi?function=analyze&days=5
. Copy and paste them to a file. Select out the success table and import into Excel. Then sort by descending success rate (example)