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Moreover the traceroute shows that a packet takes more of a circuitous route to DESY (near Hamburg) from Frankfurt. Following We found more details on the route by looking at the WIN.DFN OWAMP map which shows which nodes are connected to which. The following table summarizes this indirect route.
From | To | Direction | Approx. Distance in km | Approx. Average RTT in ms | GeoIPTool | |
|---|---|---|---|---|---|---|
Frankfurt (esnet-wash.rt1.fra.de.geant2.net) | Potsdam (zr-pot1-te0-0-0-4.x-win.dfn.de) | Potsdam is near Berlin NE of Frankfurt | 525km | 14ms | 30km SE Bonn, 50.55N, 7.4E | 30km SE Bonn, 50.55N, 7.4E |
Potsdam (zr-pot1-te0-0-0-4.x-win.dfn.de) | Tubingen (xr-tub1-vlan500.x-win.dfn.de) | Tubingen is SW of Potsdam | 650km | ?3ms | 30km SE Bonn, 50.55N, 7.4E | 30km SE Bonn, 50.55N, 7.4E |
Tubingen Tubingen (xr-tub1-vlan500.x-win.dfn.de) | Jena (xr-des1-te1-1.x-win.dfn.de) | Jena is NE of Tubingen | 445km | 4ms | 30km SE Bonn, 50.55N, 7.4E | 30km SE Bonn, 50.55N, 7.4E |
Jena (xr-des1-te1-1.x-win.dfn.de) | Frankfurt (kr-desy.x-win.dfn.de) | Frankfurt is SW of Jena | 300km | 5ms | 30km SE Bonn, 50.55N, 7.4E | 30km SE Bonn, 50.55N, 7.4E |
Frankfurt (kr-desy.x- Frankfurt (kr-desy.x-win.dfn.de) | Hamburg (rt-198-5.desy.de) | Hamburg is N of Frankfurt | 500km | 1ms | Hamburg, 53.7333N, 9.9E | Hamburg, 53.55N, 10E |
Hamburg (rt-198-5.desy.de) | DESY (mms1.desy.de) | DESY is near Hamburg | 8km | 4ms | Hamburg, 53.55N, 10E | Hamburg, 53.55N, 10E |
The map below shows the paths on a map. Note Garsching is located close to Munich, and Tubingen is close to Reutlingen. The route from Frankfurt to DESY is shwon in red, and from Frankfurt to Garsching is in blue.
This observation also points out that RTT based geolocation techniques cannot be relied upon in case of such circuitous routes.