[outages] routing loop in cogent?

[Jeremy Chadwick]

On Mon, Jun 23, 2008 at 10:03:39PM -0400, Josh Fiske wrote:
> Complete traceroute for the interested...  (FWIW, 205.232.34.1 is the DNS for a small ISP in central NY.)  At this point, I cannot determine whether they have dropped off the map or whether Cogent is just mis-routing traffic...I don't have another host on the other side of Cogent's cloud to trace to.

FWIW, I see the same thing from a different source (72.20.106.2):

traceroute to 205.232.34.1 (205.232.34.1), 64 hops max, 40 byte packets
 1  72.20.106.1 (72.20.106.1)  0.617 ms  0.612 ms  0.407 ms
 2  er0sc1-g2-0.bayarea.net (209.128.116.90)  0.395 ms  0.283 ms  0.239 ms
 3  er0sc1-g2-1.BAYAREA.NET (209.128.95.91)  0.398 ms  0.290 ms  0.240 ms
 4  ge-7-19.car1.SanJose1.Level3.net (4.79.219.105)  6.478 ms  1.069 ms  0.864 ms
 5  vlan69.csw1.SanJose1.Level3.net (4.68.18.62)  12.565 ms  1.067 ms  0.865 ms
 6  ae-64-64.ebr4.SanJose1.Level3.net (4.69.134.241)  5.855 ms  8.256 ms  1.335 ms
 7  ae-2.ebr4.NewYork1.Level3.net (4.69.135.186)  120.723 ms  121.408 ms  127.543 ms
 8  ae-74-74.csw2.NewYork1.Level3.net (4.69.134.118)  124.579 ms  126.670 ms  126.923 ms
 9  ae-21-79.car1.NewYork1.Level3.net (4.68.16.67)  80.583 ms
    ae-31-89.car1.NewYork1.Level3.net (4.68.16.131)  80.788 ms  80.472 ms
10  unknown.Level3.net (63.208.174.2)  135.902 ms  129.309 ms  126.605 ms
11  as1.core02.asbnva01.paetec.net (169.130.81.230)  80.898 ms  80.953 ms  81.211 ms
12  so-0-1-0.core01.asbnva01.paetec.net (169.130.81.85)  80.587 ms  80.496 ms  80.741 ms
13  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  80.585 ms  80.604 ms  80.744 ms
14  uslec.iad01.atlas.cogentco.com (154.54.11.214)  81.052 ms  80.858 ms  80.914 ms
15  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  80.936 ms  80.741 ms  80.902 ms
16  * * uslec.iad01.atlas.cogentco.com (154.54.11.214)  81.039 ms
17  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  81.092 ms  80.618 ms  80.787 ms
18  uslec.iad01.atlas.cogentco.com (154.54.11.214)  80.897 ms  81.551 ms  81.051 ms
19  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  81.050 ms  81.082 ms  81.523 ms
20  * * *
21  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  81.833 ms  81.716 ms  81.744 ms
22  uslec.iad01.atlas.cogentco.com (154.54.11.214)  81.564 ms  81.462 ms  81.992 ms
23  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  81.364 ms  81.866 ms  82.318 ms
^C

-- 
| Jeremy Chadwick                                jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |