Update: This has been fixed
For the last week or so, Comcast's IPv6 routing from Salt Lake City to Denver has been hosed. It's dropping packets, not even sending ICMPv6 failure messages. I thought users here might be outraged on my behalf and get it seen by someone who has the power to get it fixed.
Tracing route to he.net [2001:470:0:76::2] over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms 2601:b:5880:520:xxxx:xxxx:xxxx:xxxx
2 9 ms 8 ms 8 ms 2001:558:6008:40::1
3 8 ms 8 ms 8 ms te-0-5-0-4-sur02.orem.ut.utah.comcast.net [2001:558:102:2036::1]
4 12 ms 14 ms 13 ms te-0-7-0-0-ar02.sandy.ut.utah.comcast.net [2001:558:100:63::1]
5 11 ms 14 ms 14 ms te-7-4-ar02.