The shaperprobe test program from M-Lab is not working. The problem appears to be a routing loop in google's realm. Emails to m-lab over the past month were not effective in resolving the issue. shaperprobe: http://www.measurementlab.net/tools/shaperprobe 64.9.225.153 is server shaperprobe uses. Traceroute showing routing loop: $ traceroute 64.9.225.153 traceroute to 64.9.225.153 (64.9.225.153), 64 hops max, 40 byte packets 1 cat6509-vlan5.edm.tera-byte.com (216.234.161.129) 0.428 ms 0.658 ms 0.399 ms 2 * * * 3 core3-edmonton_1-0-0.net.bell.ca (64.230.119.244) 18.289 ms core4-edmonton_1-0-0.net.bell.ca (64.230.119.246) 18.305 ms core3-edmonton_1-0-0.net.bell.ca (64.230.119.244) 18.308 ms 4 core4-edmonton_pos10-1-0.net.bell.ca (64.230.77.201) 19.619 ms 18.325 ms core3-vancouver_pos15-1-0.net.bell.ca (64.230.77.203) 20.342 ms 5 tcore3-seattle_hundredgige0-5-0-0.net.bell.ca (64.230.79.92) 22.857 ms tcore4-seattle_hundredgige0-9-0-0.net.bell.ca (64.230.79.98) 21.344 ms 18.256 ms 6 bx4-seattle_xe1-0-0.net.bell.ca (64.230.125.245) 18.923 ms 18.950 ms bx4-seattle_xe8-0-0.net.bell.ca (64.230.125.247) 18.099 ms 7 Global_Crossing_bx3-seattle.net.bell.ca (67.69.246.206) 17.221 ms ge-9-29-1G.ar5.sea1.gblx.net (64.212.107.53) 33.570 ms Global_Crossing_bx3-seattle.net.bell.ca (67.69.246.206) 171.896 ms 8 204.245.39.194 (204.245.39.194) 74.329 ms 73.353 ms 74.364 ms 9 64.9.224.130 (64.9.224.130) 75.516 ms 75.441 ms 75.421 ms 10 64.9.224.142 (64.9.224.142) 74.722 ms 73.774 ms 73.741 ms 11 64.9.224.230 (64.9.224.230) 74.525 ms 75.333 ms 75.360 ms 12 64.9.224.229 (64.9.224.229) 73.637 ms 74.666 ms 74.619 ms 13 64.9.224.230 (64.9.224.230) 74.812 ms 75.119 ms 75.467 ms 14 64.9.224.229 (64.9.224.229) 73.819 ms 74.694 ms 74.734 ms 15 64.9.224.230 (64.9.224.230) 75.553 ms 74.605 ms 75.588 ms 16 64.9.224.229 (64.9.224.229) 73.833 ms 74.745 ms 73.794 ms 17 64.9.224.230 (64.9.224.230) 74.689 ms 74.691 ms 75.701 ms 18 64.9.224.229 (64.9.224.229) 73.837 ms 74.786 ms 74.986 ms 19 64.9.224.230 (64.9.224.230) 74.722 ms 75.720 ms 75.212 ms 20 64.9.224.229 (64.9.224.229) 74.868 ms 74.881 ms 73.911 ms 21 64.9.224.230 (64.9.224.230) 74.857 ms 74.846 ms 74.788 ms 22 64.9.224.229 (64.9.224.229) 74.909 ms 74.952 ms 73.975 ms 23 64.9.224.230 (64.9.224.230) 75.860 ms 74.898 ms 79.610 ms 24 64.9.224.229 (64.9.224.229) 75.046 ms 74.098 ms 74.112 ms 25 64.9.224.230 (64.9.224.230) 74.928 ms 74.968 ms 75.976 ms 26 64.9.224.229 (64.9.224.229) 74.093 ms 75.088 ms 75.015 ms 27 64.9.224.230 (64.9.224.230) 76.031 ms 75.050 ms 75.989 ms 28 64.9.224.229 (64.9.224.229) 107.876 ms 74.216 ms 75.263 ms 29 64.9.224.230 (64.9.224.230) 75.253 ms 81.958 ms 76.030 ms 30 64.9.224.229 (64.9.224.229) 75.196 ms 75.149 ms 74.183 ms 31 64.9.224.230 (64.9.224.230) 76.127 ms 76.370 ms 75.149 ms 32 64.9.224.229 (64.9.224.229) 75.199 ms 74.242 ms 75.240 ms 33 64.9.224.230 (64.9.224.230) 76.514 ms 75.286 ms 76.278 ms 34 64.9.224.229 (64.9.224.229) 75.308 ms 75.253 ms 75.270 ms 35 64.9.224.230 (64.9.224.230) 75.493 ms 76.337 ms 75.282 ms 36 64.9.224.229 (64.9.224.229) 75.312 ms 75.359 ms 75.344 ms 37 64.9.224.230 (64.9.224.230) 75.449 ms 75.395 ms 75.745 ms 38 64.9.224.229 (64.9.224.229) 74.486 ms 75.419 ms 74.524 ms 39 64.9.224.230 (64.9.224.230) 75.444 ms 76.412 ms 75.474 ms 40 64.9.224.229 (64.9.224.229) 74.467 ms 75.434 ms 75.477 ms 41 64.9.224.230 (64.9.224.230) 77.191 ms 75.567 ms 75.553 ms