Odd Cogentco routing?

David Hill dhill at mindcry.org
Sat Feb 8 02:40:35 UTC 2014


Hello -

While doing some traceroutes, I have found a few destinations that I
found a little odd.  For example:

   5.|-- bbr01aldlmi-bue-2.aldl.mi.charter.com           0.0%    60
152.1  47.2   8.3 367.6  66.0
   6.|-- bbr01sgnwmi-bue-5.sgnw.mi.charter.com           0.0%    60
102.3  53.4  15.6 317.9  66.3
   7.|-- be4041.nr21.b016069-0.dtw04.atlas.cogentco.com  0.0%    60
78.9  58.3  19.6 267.9  62.1
   8.|-- te0-5-0-5.rcr21.dtw04.atlas.cogentco.com        0.0%    60
32.6  58.2  20.3 218.3  54.6
   9.|-- te4-2.ccr01.tol01.atlas.cogentco.com            0.0%    60
359.6  95.2  21.4 359.6  84.5
  10.|-- te0-5-0-1.ccr21.cle04.atlas.cogentco.com        0.0%    60
24.3  70.0  24.3 219.3  52.5
  11.|-- te7-2.ccr01.buf02.atlas.cogentco.com            0.0%    60
29.3  89.9  28.8 245.4  66.0
  12.|-- te7-2.ccr01.yhm01.atlas.cogentco.com            0.0%    60
117.6 105.0  30.6 467.8  87.7
  13.|-- te0-7-0-34.ccr21.yyz02.atlas.cogentco.com       0.0%    60
167.5  65.8  32.0 316.7  51.7
  14.|-- level3.yyz02.atlas.cogentco.com                15.0%    60
132.0  91.2  47.6 326.1  57.9
  15.|-- ae-13-13.bar1.Toronto1.Level3.net              61.7%    60
62.4 107.9  49.5 282.7  73.0
  16.|-- ae-9-9.ebr1.Chicago1.Level3.net                 0.0%    60
92.4 116.8  69.6 315.0  59.2
  17.|-- ae-1-100.ebr2.Chicago1.Level3.net               1.7%    60
92.3 127.7  71.2 370.1  62.1
  18.|-- ae-3-3.ebr2.Atlanta2.Level3.net                 0.0%    60
74.6 125.5  70.7 261.0  50.3
  19.|-- ae-2-52.edge4.Atlanta2.Level3.net               0.0%    60
75.0 121.0  71.0 252.4  45.6

Detroit -> Toledo -> Cleveland -> Buffalo -> Hamilton, ON -> Toronto ->
Chicago..

Is it odd that Cogentco is routing USA traffic to Canada and handing it
off there to Level3 just to bring it back in to the USA?  There is also
some packetloss at the exchange...

Thanks,
David

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