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Anjum pointed out that there are working PingER monitors that SLAC appears unable to gather data from.
Raja
Added 92 new perfSONAR landmarks to TULIP DB, 48 of which are geographically unique. This gives us a total of 1010 landmarks, 316 of which are currently enabled of geolocation.
A link to Vtrace from the perfSONAR home page has been added. perfSONAR has updated to a new release. With this there are motre perfSONAR landmarks now available.
Raja, Umar and Les are working on a paper on TULIP and its application to Visual Tracerouting to be submitted later this year
PingER at SLAC
Les requested an update from Yahoo about TULIP's gelocation. They answered "We are very much interested in getting IP triangulation at internet scale, we will have internal sync-up on how we can leverage this initiative if there is rate limit and get back. Regarding opening up yahoo sites for deploying ping server requires some more time to discuss this with relevant stake holders with in yahoo."The PingER monitoring hosts at Taiwan, FNAL, UERJ(.br), sprace(.br), and South Africa(.za) have been restored to a working state.
Les sent email to Google as follows: "I would like to bring to your attention that we have developed a geolocation tool using delay based (using RTTs from known ping server landmarks) distance estimates to triangulate the location of an IP host target. The tools is accessible at: http://www-wanmon.slac.stanford.edu/cgi-wrap/reflex.cgi. We have identified that the accuracy of the geolocation is directly related to the landmark density (e.g. # of landmarks/ million sq km). The higher the density the smaller the error. We currently have over 1000 registered landmarks, of which at any given time ~300 are working. The tool not onlyfinds the location of the target, it also gives an estimated error. To the best of our knowledge it is the only freely available delay based measurement geolocation tool publicly available today. A drawback (compared to database methods such as those based on GeoMind) is the time taken to make the measurements. We have worked in this from manydirections including parallelization of the ping requests, caching, tiering to get the rough location (i.e. region of the world) then zooming in using all landmarks in the region. We are putting together a publication on this."
The PingER monitoring hosts at Taiwan, FNAL, UERJ(.br), sprace(.br), and South Africa(.za) have been restored to a working state.
Les contacted the Hong Kong, Rutherford Lab (.uk), Daresbury Lab (.uk), CEFET (.br, UNESP(.br) and ACMESecurity (.br) PingER monitors to try and get them fixed. The Hong Kong contact has retired.
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