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Examples

This page is intended for showing cases where database techniques such as GeoIpTool and Networld are very inaccurate and hence measurement based techniques such as ACBG and CBG are required. There is also a Confluence Page on this topic.

ae-6-6.ebr2.Frankfurt1.Level3.net

The name of the router suggests that it is near Frankfurt and that's what both ACBG and CBG estimates convey, GeoIP and Networld however show it in USA.


ae-48-48.ebr1.Amsterdam1.Level3.net

The name of the router suggests that it is in Amsterdam and that's what both ACBG and CBG estimates convey, GeoIP and Networld however show it in USA.

kanscr5-ip-a-denvcr5.es.net

The name of the router suggests that it is somewhere is kansas and that's what both ACBG and CBG estimates convey, the database tools however show them as being on the opposite corners of the country

kansas

denvcr5-ip-b-denvcr2.es.net

ACBG and CBG find the router to be in Denver city which is what the name implies. The result of GeoIpTool points to San Francisco where as Networld suggests it is in New York City.

sacrcr5-ip-a-sunncr5.es.net

The name of the router suggests that it is in Sacramento and that's what both ACBG and CBG estimates convey, GeoIP however show them as being in San Francisco and Networld thinks it in NewYork.

chiccr5-ip-a-kanscr5.es.net

The name of the router suggests that it is in Chicago and that's what both ACBG and CBG estimates convey, GeoIP however show them as being in San Francisco and Networld thinks it in NewYork.

nust.edu.pk

This webserver is in NUST Main Campus, ACBG got it exactly right, CBG got in narrowed down to the city with the marker in right place. GeoIP gives the location as Center of Pakistan and Networld has no idea at all.


gk1.es.net

This is a Tandberg video conference gateway located at LBL and owned by ESnet. In the maps below it is seen that the maximum distance measured from a landmark in Chicago prevents the possible area extending to LBL/Berkeley (just North of Oakland).


If one removes the Chicago landmark then the result is below.

www.cs.vt.edu

This is the web server at Virginia Tech in Blacksburg Virginia. In the map below the impact of the constraints provided by the inner circles for the minimum value of alpha can be seen. It is also seen that if one were to remove the water area to the East then the centroid of the acceptable area would move Westwards and since the area is reduced the error would also be reduced.