The From landmarks drop down list is populated from /nfs/slac/g/net/pinger/tulip/from.txt. for Landmark_HostName see in some cases the HostName is the same as IP.Landmark_HostName&target= target_IP_or_HostName. ![]() Visual Traceroute can be called directly from URL. List of possible PerfSONAR landmarks is /nfs/slac/g/net/pinger/tulip/psonar_vtrace.txt.List of possible PingER landmarks is /nfs/slac/g/net/pinger/tulip/pinger_vtrace.txt.The database used is /nfs/slac/g/net/pinger/tulip/citidb.txtīoth PingER and PerfSONAR landmarks can be used as the traceroute source.Working SpecificsĪ subset of the Maxmind city database is used to find the nearest city to each router, only cities with population greater than 100,000 are considered. If the location of all the routers in the requested vtrace are cached then it takes only about 10 secs to give the output. As the router locations are found they are automatically cached in /nfs/slac/g/net/pinger/tulip/cachetr/cache.txt Normally it would take about 10 mins to perform a complete visual traceroute but we have incorporated caching to speed up the process. ESnet routers may supposedly be located in Berkeley). ![]() We use TULIP's dynamic ping-based geolocation as compared to say database methods such as used by MaxMind derived tools like GeoIPTools, since often router locations in the database tend to be given as at the corporate HQ that owns the routers (e.g. It works by first finding the traceroute to the target using the installed at the landmark node and then geolocating each of the intermediate hop routers using TULIP.
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