We are investigating. -------- Original Message -------- From: Casey Deccio <casey@deccio.net> Sent: Thu, 07/06/2012 18:47 To: nanog@nanog.org CC: Subject: sporadic IPv6 connectivity to forums.comcast.com I'm seeing sporadic IPv6 connectivity issues to forums.comcast.com: casey@rome$ curl -I6 forums.comcast.com HTTP/1.1 200 OK Date: Thu, 07 Jun 2012 21:48:37 GMT [snip...] casey@rome$ curl -I6 forums.comcast.com curl: (7) couldn't connect to host casey@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@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