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Both PingER and PerfSONAR landmarks use traceroute.pl to send pings to the target host when called. Each landmark sends 5 pings to the target and the min RTT value is selected for use is multilateration. By default the waiting time between pings is 1 sec but this can be changed from version 6.3 or later of traceroute.pl. Using a gap of 0.2 sec reduces the time taken per landmark by 4 fold. Since we have over 100 active PingER and PerfSONAR, this change would greatly increase the geolocation speed. All landmarks should be upgraded to the latest version of traceroute.pl
The current (10/3/13) list of traceroute.pl versions installed is : traceroute_versions.xlsx
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