![]() ![]() Vtrace and undns agree for Australia and for hops in the US. However the route in Australia and the US is badly off. ![]() Maxmind gets the location of the host in French Polynesia. The TULIP plot shows how the paucity of nearby landmarks (black market balloons) results in the poor geolocation of the Braga site. The traceroute figure which indicates that hops 12 and 13 are likely to be in the Netherlands and the UK given their naming conventions (note the top level domains. However, note that the Vtrace accuracy circles indicate the considerable uncertainty in the location of the last hop, hence improving one's confidence. The Portugal detail indicates that Maxmind is more accurate in showing the final route to Braga. Moving futher right, Vtrace shows the route through the Netherlands and the UK, while Maxmind misses the Netherlands altogether. The left hand map shows how VTrace accurately traces the route across the US, while Maxmind jumps from SLAC to the middle of the US, back to Berkeley and thence to Europe. This is illustrated in the plots below from SLAC to a host in Braga Portugal (193.136.19.13). Comparisons between MaxMind and TULIPīy providing both VTrace (red) and Maxmind (blue) routes, the results can be complementary in ascertaining the correct route. This figure shows the traceroute from SLAC to NUST Pakistan. The hops are shown as appropriate numbered markers, the error in the estimated location is shown as a red circle. One (shown in red) is drawn using TULIP and the other (shown in blue) is drawn using MaxMind (an IP host location database). Two traceroute paths are shown on the google map. Clicking on the ASN will provide information on the ASN. Clicking on the IP address will take you to the TULIP geolocation utility. The tabular traceroute is shown together with the Autonomous System Number (ASN), if known, the router's location coordinates and distance between hops. A script tries to geolocate such routers in the cache and updates the cache accordingly each night.īoth and are placed in /afs/slac/package/pinger/tulip/ and executed via trscrontab in for user pinger. This list if checked and updated daily from crontab using Ĭertain routers can not be geolocated because they respond to only a few pings or don't respond to them at all. 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. .edu.my, University of Malaya, Kuala Lumpur, Malaysia., Australia's Academic and Research Network, Melbourne, Australia., National University of Science and Technology, Islamabad, Pakistan.SLAC National Accelerator Lab, near San Francisco, California, USA.Some of these are listed below, for a complete list check the from dropdown: Currently it can provide visual traceroute from 29 landmarks (2 in USA and 1 per each of 27 countries). Visual Traceroute is a new feature that can be accessed by calling reflector.cgi with function=vtrace. ![]()
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