I don't know if this is a transient route issue, but I noticed the bounce from nyc->ams->dus->nyc...
traceroute to 6bone.net (2001:5c0:0:2::24) from 2001:470:8068::2, 30 hops max, 16 byte packets
1 nerdbox.tunnel.tserv3.fmt2.ipv6.he.net (2001:470:1f04:351::1) 10.481 ms 10.56 ms 10.419 ms
2 1g-3-20.core1.fmt2.ipv6.he.net (2001:470:0:45::1) 9.903 ms 9.925 ms 14.261 ms
3 10g-1-1.core1.sjc2.ipv6.he.net (2001:470:0:31::2) 10.141 ms 10.137 ms 10.023 ms
4 equi6ix.sv.iij.com (2001:504:0:1::2497:1) 10.763 ms 10.677 ms 10.508 ms
5 equinix6-sjc.ip.tiscali.net (2001:504:0:1::3257:1) 15.665 ms 14.97 ms 14.888 ms
6 so-2-0-0.chi11.ip6.tiscali.net (2001:668:0:2::1:151) 70.101 ms 71.052 ms 74.141 ms
7 so-4-1-0.nyc22.ip6.tiscali.net (2001:668:0:2::1:742) 100.933 ms 98.16 ms 100.062 ms
8 so-7-1-0.ams22.ip6.tiscali.net (2001:668:0:2::1:881) 174.889 ms 170.714 ms 173.104 ms
9 so-4-0-0.dus11.ip6.tiscali.net (2001:668:0:2::1:121) 188.736 ms 187.457 ms 183.068 ms
10 so-0-0-0.ham10.ip6.tiscali.net (2001:668:0:2::101) 222.726 ms 186.981 ms 184.022 ms
11 sl-bb1v6-bru-t-7.sprintv6.net (2001:440:eeee:ffe4::1) 207.818 ms 204.354 ms 205.269 ms
12 sl-bb1v6-nyc-t-1002.sprintv6.net (2001:440:1239:100c::1) 203.939 ms 217.747 ms 203.744 ms
13 2001:440:eeee:ffca::2 (2001:440:eeee:ffca::2) 246.825 ms 248.427 ms 247.036 ms
14 classical.hexago.com (2001:5c0:0:2::24) 247.225 ms 247.176 ms 248.655 ms
--
Steve