Appendix 3: Network Paths

Synchronous Learning at a Distance:
Experiences with Tango

The traceroute below illustrates the asymmetry of the network path:

  NPAC % traceroute moses.wes.hpc.mil
  traceroute to moses.wes.hpc.mil (134.164.3.20)
  1  npac1-117 (128.230.117.1)3 ms  1 ms  1 ms
  2  npac1-8 (128.230.8.1)  14 ms   7 ms   9 ms 
  3  npac-gw (128.230.144.1)  7 ms  8 ms  3 ms
  4  syrgate.syr.edu (128.230.220.1)  42 ms  8 ms  6 ms
  5  at-gw3-syr-1-0-T3.nysernet.net (169.130.33.9)  5 ms  3 ms  6 ms
  6  at-gw2-syr-0-0-0.nysernet.net (169.130.251.2)  3 ms  7 ms  7 ms
  7  at-gw1-ith-0-0-T3.nysernet.net (169.130.1.42)  9 ms  9 ms  8 ms
  8  at-gw2-ith-0-0.nysernet.net (169.130.60.2)  8 ms  9 ms  10 ms
  9  at-bb1-pen-5-0-0-T3.nysernet.net (169.130.1.121)  22 ms  23 ms  22 ms
  10  144.228.60.11 (144.228.60.11)  27 ms  25 ms  23 ms
  11  sl-bb10-pen-0-1.sprintlink.net (144.232.5.5)  25 ms  28 ms 26 ms 
  12  144.232.5.62 (144.232.5.62)  24 ms   26 ms   28 ms
  13  sprint-nap.dren.net (192.157.69.55)  48 ms   37 ms 29 ms 
  14  arl-apg-h3-0.dren.net (138.18.253.2)  39 ms   40 ms 39 ms 
  15  nrl-dc-a11-0-2.dren.net (138.18.241.1)  41 ms   41 ms 41 ms
  16  cewes-h2-0.dren.net (138.18.189.2)  67 ms   57 ms 61 ms 
  17  134.164.2.4 (134.164.2.4)  62 ms   55 ms   58 ms
  18  134.164.13.55 (134.164.13.55)  62 ms  61 ms   70ms 
  19  134.164.35.221 (134.164.35.221)  79 ms   69 ms   63 ms 
  20  134.164.3.34 (134.164.3.34)  60 ms   60 ms   58 ms
  21  moses.wes.army.mil (134.164.3.20)  65 ms   62 ms 60 ms 


  JSU % traceroute brickyard.npac.syr.edu
  traceroute to brickyard.npac.syr.edu (128.230.117.28)
  1  134.164.3.1 (134.164.3.1)  2 ms  2 ms  2 ms
  2  134.164.3.33 (134.164.3.33)  5 ms  5 ms  5 ms
  3  134.164.35.9 (134.164.35.9)  4 ms  5 ms  4 ms
  4  wesdmz2.wes.hpc.mil (134.164.13.70)  4 ms  4 ms  5 ms
  5  134.164.2.1 (134.164.2.1)  5 ms  5 ms  8 ms
  6  nrl-dc-h4-0.dren.net (138.18.189.1)  30 ms  30 ms  30 ms
  7  arl-apg-a10-0-2.dren.net (138.18.241.2)  34 ms  34 ms  34 ms
  8  sprintnap-h1-0.dren.net (138.18.253.1)  37 ms  37 ms  37 ms
  9  icm-pen-10.icp.net (192.157.69.21)  39 ms   139 ms 39 ms 
  10  icm-pen-11-P4/0-OC3C.icp.net (198.67.142.74)  42 ms   39 ms 43 ms 
  11  144.232.5.157 (144.232.5.157)  40 ms   37 ms  42ms 
  12  sl-bb2-dc-5-0-0-155M.sprintlink.net (144.232.8.2)  41 ms   40ms  43 ms 
  13  sl-bb3-dc-4-0-0-155M.sprintlink.net (144.232.0.6)  42 ms   43ms  43 ms 
  14  at-bb1-dc-1-0-0.nysernet.net (144.228.20.110)  44 ms  43 ms 44 ms 
  15  at-gw4-syr-0-1-0.nysernet.net (169.130.1.93)  60 ms  56 ms 62 ms 
  16  at-syruniy-1-0-T3.nysernet.net (169.130.33.10)  61 ms   205ms  212 ms 
  17  syr0-0100.syr.edu (128.230.220.2)  56 ms  64 ms 63 ms 
  18  npac1-144.npac.syr.edu (128.230.144.2)  63 ms   65 ms  64 ms 
  19  lanplex-008.npac.syr.edu (128.230.8.3)  57 ms   60 ms 56 ms 
  20  brickyard.npac.syr.edu (128.230.117.28)  62 ms  66 ms69 ms