sporadic IPv6 connectivity to forums.comcast.com

Brzozowski, John John_Brzozowski at Cable.Comcast.com
Fri Jun 8 00:11:55 UTC 2012


We are investigating.

-------- Original Message --------
 From: Casey Deccio <casey at deccio.net>
 Sent: Thu, 07/06/2012 18:47
 To: nanog at nanog.org
 CC:
 Subject: sporadic IPv6 connectivity to forums.comcast.com


I'm seeing sporadic IPv6 connectivity issues to forums.comcast.com:

casey at rome$ curl -I6 forums.comcast.com
HTTP/1.1 200 OK
Date: Thu, 07 Jun 2012 21:48:37 GMT
[snip...]

casey at rome$ curl -I6 forums.comcast.com
curl: (7) couldn't connect to host

casey at rome:~$ traceroute6 forums.comcast.com
traceroute to forums.comcast.com (2620:6a:8000:4::11) from
2001:470:21:31::adf5:492a, port 33434, from port 42309, 30 hops max, 60
byte packets
 1  2001:470:21:31::1 (2001:470:21:31::1)  1.713 ms  1.922 ms  2.039 ms
 2  2001:470:1f:b::1 (2001:470:1f:b::1)  10.575 ms  3.343 ms  3.147 ms
 3  10gigabitethernet1-1.core1.sjc1.he.net (2001:470:1:7c::1)  6.855 ms
 4.225 ms  4.252 ms
 4  10gigabitethernet2-1.core1.sjc2.he.net (2001:470:0:55::2)  4.271 ms
 14.442 ms  4.469 ms
 5  sjo-eqx-s1-link.telia.net (2001:2000:3080:1b7::1)  5.385 ms  4.669 ms
 4.434 ms
 6  internap-ic-140172-sjo-bb1.c.telia.net (2001:2000:3080:17f::2)  4.702
ms  4.803 ms  4.848 ms
 7  border1-bbnet2.sje.pnap.net (2600:c02:0:102::1:1)  5.175 ms  25.023 ms
 4.808 ms
 8  lithiumtechinc-2.border1.sje.pnap.net (2600:c02:1001:3::2)  9.445 ms
 8.120 ms  7.804 ms
 9  2620:6a:8000:4::11 (2620:6a:8000:4::11)  5.491 ms  5.712 ms  5.873 ms

casey at rome:~$ traceroute6 forums.comcast.com
traceroute to forums.comcast.com (2620:6a:8000:4::11) from
2001:470:21:31::adf5:492a, port 33434, from port 42311, 30 hops max, 60
byte packets
 1  2001:470:21:31::1 (2001:470:21:31::1)  1.574 ms  1.514 ms  1.856 ms
 2  2001:470:1f:b::1 (2001:470:1f:b::1)  2.882 ms  3.089 ms  14.462 ms
 3  10gigabitethernet1-1.core1.sjc1.he.net (2001:470:1:7c::1)  4.573 ms
 4.466 ms  6.683 ms
 4  10gigabitethernet2-1.core1.sjc2.he.net (2001:470:0:55::2)  4.525 ms
 10.401 ms  4.748 ms
 5  sjo-eqx-s1-link.telia.net (2001:2000:3080:1b7::1)  4.794 ms  4.931 ms
 4.406 ms
 6  internap-ic-140172-sjo-bb1.c.telia.net (2001:2000:3080:17f::2)  4.837
ms  4.922 ms  4.527 ms
 7  border1-bbnet1.sje.pnap.net (2600:c02:0:101::1:1)  5.884 ms  4.626 ms
 5.037 ms
 8  border3-bbnet2.sje.pnap.net (2600:c02:0:102::1:3)  3157.850 ms !H
 3270.481 ms !H  3226.411 ms !H

Is this perhaps a routing issue?

Casey




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