I am using Charter's 6rd IPv6 tunnel at home and noticed within the last few days I can't get to/from my Digital Ocean VM via IPv6. From both Digital Ocean and Charter 6rd tunnel I can get to Google, Facebook, etc via IPv6 but not to each other. It appears there are routing issues in GTT as it hits 64 hops and gives up. I haven't found more examples.
From DO to Charter:
vm# mtr -6 -c 1 -r gw.feld.me Start: Tue Oct 7 07:49:56 2014 HOST: vm.feld.me Loss% Snt Last Avg Best Wrst StDev 1.|-- 2001:19f0:5c00:8000::1 0.0% 1 0.4 0.4 0.4 0.4 0.0 2.|-- unknown.ipv6.scnet.net 0.0% 1 8.2 8.2 8.2 8.2 0.0 3.|-- ae9-0.cr1.ord6.scnet.net 0.0% 1 0.4 0.4 0.4 0.4 0.0 4.|-- xe-11-3-3.edge4.Chicago2. 0.0% 1 1.3 1.3 1.3 1.3 0.0 5.|-- vl-52.edge1.Chicago2.Leve 0.0% 1 1.4 1.4 1.4 1.4 0.0 6.|-- vl-4042.edge6.Denver1.Lev 0.0% 1 54.6 54.6 54.6 54.6 0.0 7.|-- vl-4081.edge3.Denver1.Lev 0.0% 1 26.0 26.0 26.0 26.0 0.0 8.|-- vl-4040.edge2.Dallas1.Lev 0.0% 1 39.9 39.9 39.9 39.9 0.0 9.|-- 2001:1900:4:1::82 0.0% 1 40.3 40.3 40.3 40.3 0.0 10.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0
From Charter to DO:
$ traceroute6 vm.feld.me traceroute6 to feld.me (2001:19f0:5c00:8014::64) from 2602:100:4475:7e4e::1, 64 hops max, 12 byte packets 1 fe80::4472:a501%gif0 32.685 ms 31.124 ms 27.724 ms 2 2001:506:100:6c::1 32.265 ms 28.213 ms 27.935 ms 3 bbr01olvemo-tge0-3-0-4.mo.olve.charter.com 36.85 ms 48.545 ms 31.973 ms 4 bbr02chcgil-tge0-0-0-4.il.chcg.charter.com 44.528 ms 42.71 ms 39.903 ms 5 bbr02ashbva-tge0-0-0-6.va.ashb.charter.com 60.637 ms 58.762 ms 56.091 ms 6 bbr01rvsdca-tge0-0-0-1.ca.rvsd.charter.com 57.898 ms 58.219 ms 54.158 ms 7 ae7.ar2.iad1.us.as4436.gtt.net 61.978 ms 59.916 ms 60.278 ms 8 ae4-60g.cr1.iad1.us.as4436.gtt.net 58.154 ms 60.057 ms 55.868 ms 9 ae1-30g.ar2.iad1.us.as4436.gtt.net 57.846 ms 57.986 ms 59.022 ms 10 ae4-60g.cr1.iad1.us.as4436.gtt.net 67.351 ms 92.237 ms 59.19 ms 11 ae1-30g.ar2.iad1.us.as4436.gtt.net 55.398 ms 57.944 ms 58.273 ms 12 ae4-60g.cr1.iad1.us.as4436.gtt.net 67.278 ms 58.613 ms 60 ms 13 ae1-30g.ar2.iad1.us.as4436.gtt.net 62.251 ms 58.714 ms 58.63 ms 14 ae4-60g.cr1.iad1.us.as4436.gtt.net 55.916 ms 62.16 ms 59.304 ms 15 ae1-30g.ar2.iad1.us.as4436.gtt.net 57.715 ms 56.235 ms 56.446 ms 16 ae4-60g.cr1.iad1.us.as4436.gtt.net 59.155 ms 59.564 ms 56.403 ms 17 ae1-30g.ar2.iad1.us.as4436.gtt.net 62.394 ms 55.362 ms 64.127 ms 18 ae4-60g.cr1.iad1.us.as4436.gtt.net 59.598 ms 60.619 ms 107.678 ms 19 ae1-30g.ar2.iad1.us.as4436.gtt.net 58.614 ms 58.28 ms 59.954 ms 20 ae4-60g.cr1.iad1.us.as4436.gtt.net 59.941 ms 59.788 ms 59.851 ms 21 ae1-30g.ar2.iad1.us.as4436.gtt.net 59.704 ms 59.33 ms 60.827 ms 22 ae4-60g.cr1.iad1.us.as4436.gtt.net 59.67 ms 59.831 ms 59.795 ms 23 ae1-30g.ar2.iad1.us.as4436.gtt.net 59.432 ms 61.336 ms 58.184 ms 24 ae4-60g.cr1.iad1.us.as4436.gtt.net 59.273 ms 55.066 ms 59.906 ms 25 ae1-30g.ar2.iad1.us.as4436.gtt.net 58.329 ms 62.6 ms 58.157 ms 26 ae4-60g.cr1.iad1.us.as4436.gtt.net 64.339 ms 60.07 ms 91.983 ms 27 ae1-30g.ar2.iad1.us.as4436.gtt.net 55.495 ms 59.945 ms 58.529 ms 28 ae4-60g.cr1.iad1.us.as4436.gtt.net 59.684 ms 55.512 ms 56.048 ms 29 ae1-30g.ar2.iad1.us.as4436.gtt.net 62.383 ms 60.182 ms 60.635 ms 30 ae4-60g.cr1.iad1.us.as4436.gtt.net 60.138 ms 59.713 ms 59.933 ms 31 ae1-30g.ar2.iad1.us.as4436.gtt.net 55.755 ms 62.042 ms 62.369 ms 32 ae4-60g.cr1.iad1.us.as4436.gtt.net 59.495 ms 59.767 ms 59.984 ms 33 ae1-30g.ar2.iad1.us.as4436.gtt.net 59.285 ms 59.844 ms 60.51 ms 34 ae4-60g.cr1.iad1.us.as4436.gtt.net 58.068 ms 59.492 ms 59.975 ms 35 ae1-30g.ar2.iad1.us.as4436.gtt.net 57.425 ms 55.933 ms 62.857 ms 36 ae4-60g.cr1.iad1.us.as4436.gtt.net 59.577 ms 59.471 ms 60.15 ms 37 ae1-30g.ar2.iad1.us.as4436.gtt.net 55.244 ms 59.993 ms 56.707 ms 38 ae4-60g.cr1.iad1.us.as4436.gtt.net 59.447 ms 55.642 ms 56.026 ms 39 ae1-30g.ar2.iad1.us.as4436.gtt.net 62.152 ms 59.443 ms 59.67 ms 40 ae4-60g.cr1.iad1.us.as4436.gtt.net 60.331 ms 59.527 ms 59.971 ms 41 ae1-30g.ar2.iad1.us.as4436.gtt.net 59.352 ms 59.976 ms 62.869 ms 42 ae4-60g.cr1.iad1.us.as4436.gtt.net 59.47 ms 55.709 ms 63.582 ms 43 ae1-30g.ar2.iad1.us.as4436.gtt.net 60.37 ms 59.323 ms 63.52 ms 44 ae4-60g.cr1.iad1.us.as4436.gtt.net 58.777 ms 59.819 ms 59.708 ms 45 ae1-30g.ar2.iad1.us.as4436.gtt.net 60.087 ms 61.474 ms 58.63 ms 46 ae4-60g.cr1.iad1.us.as4436.gtt.net 60.35 ms 58.875 ms 61.964 ms 47 ae1-30g.ar2.iad1.us.as4436.gtt.net 57.275 ms 62.731 ms 64.981 ms 48 ae4-60g.cr1.iad1.us.as4436.gtt.net 60.467 ms 61.955 ms 162.171 ms 49 ae1-30g.ar2.iad1.us.as4436.gtt.net 62.204 ms 60.741 ms 60.429 ms 50 ae4-60g.cr1.iad1.us.as4436.gtt.net 59.724 ms 59.766 ms 59.897 ms 51 ae1-30g.ar2.iad1.us.as4436.gtt.net 63.145 ms 60.379 ms 65.222 ms 52 ae4-60g.cr1.iad1.us.as4436.gtt.net 61.783 ms 61.646 ms 59.696 ms 53 ae1-30g.ar2.iad1.us.as4436.gtt.net 58.354 ms 70.653 ms 59.731 ms 54 ae4-60g.cr1.iad1.us.as4436.gtt.net 60.166 ms 55.39 ms 56.422 ms 55 ae1-30g.ar2.iad1.us.as4436.gtt.net 57.719 ms 59.593 ms 62.026 ms 56 ae4-60g.cr1.iad1.us.as4436.gtt.net 55.98 ms 59.649 ms 56.294 ms 57 ae1-30g.ar2.iad1.us.as4436.gtt.net 59.6 ms 55.359 ms 63.151 ms 58 ae4-60g.cr1.iad1.us.as4436.gtt.net 56.996 ms 59.972 ms 55.79 ms 59 ae1-30g.ar2.iad1.us.as4436.gtt.net 59.749 ms 62.077 ms 62.279 ms 60 ae4-60g.cr1.iad1.us.as4436.gtt.net 55.649 ms 153.654 ms 59.83 ms 61 ae1-30g.ar2.iad1.us.as4436.gtt.net 64.475 ms 58.863 ms 62.758 ms 62 ae4-60g.cr1.iad1.us.as4436.gtt.net 59.492 ms 59.855 ms 59.569 ms 63 ae1-30g.ar2.iad1.us.as4436.gtt.net 60.276 ms 62.299 ms 60.679 ms 64 ae4-60g.cr1.iad1.us.as4436.gtt.net 60.921 ms 57.581 ms 59.567 ms