other active (probed) data sets MOAT: http://amp.nlanr.net HPC sites RTT, traceroutes I2's Surveyor: http://www.advanced.org/surveyor/ I2 sites one-way delay, paths vBNS http://www.vbns.net:8080/stats/ SLAC, NIMI, XIWT, RIPE, others (too many) http://www.caida.org/tools/taxonomy/ http://atlas.caida.org/