I don't seem to be able to reach any Level3 IPv6 address at all, neither from a he.net tunnel to Paris nor one to Amsterdam.
fransjan@d205 ~ $ tracepath6 2001:4c08:2005:0:fd08::1
1?: [LOCALHOST] 0.015ms pmtu 1500
1: 2001:470:c9a7:68::11 0.265ms
1: 2001:470:c9a7:68::11 0.232ms
2: 2001:470:c9a7:68::11 0.234ms pmtu 1480
2: SpilSysEng-1.tunnel.tserv10.par1.ipv6.he.net 20.157ms
3: gige-g2-3.core1.par1.he.net 17.869ms
4: no reply
5: no reply
6: no reply
7: no reply
8: no reply
...
20: no reply
^C
frans-jan@cirdan ~ $ tracepath6 2001:4c08:2005:0:fd08::1
1?: [LOCALHOST] pmtu 1480
1: FST777-1.tunnel.tserv11.ams1.ipv6.he.net 8.911ms
2: gige-g2-20.core1.ams1.he.net 1.272ms
3: no reply
4: no reply
5: no reply
6: no reply
7: no reply
8: no reply
...
20: no reply
^C
Works fine using a SixXS tunnel:
frans-jan@celeborn ~ $ tracepath6 2001:4c08:2005:0:fd08::1
1?: [LOCALHOST] pmtu 1500
1: ecthelion.elvandar.fst.li 0.382ms
2: ecthelion.elvandar.fst.li asymm 1 0.376ms pmtu 1280
2: gw-1623.ams-05.nl.sixxs.net 42.220ms
3: vl163.sw14.amsterdam1.surf.net 38.794ms
4: 2001:610:f01:9168::169 asymm 5 38.599ms
5: AE0.500.JNR02.Asd001A.surf.net asymm 6 40.437ms
6: ix-5-0-0.951.core2.AD1-Amsterdam.ipv6.as6453.net 40.576ms
7: no reply
8: if-0-1-0.3223.mcore3.LDN-London.ipv6.as6453.net 54.779ms
9: no reply
10: vl-4081.edge4.London1.Level3.net asymm 11 56.446ms
11: vl-4060.edge4.Amsterdam1.Level3.net asymm 10 51.538ms
12: 2001:1900:5:2:2::402 asymm 10 52.516ms
13: no reply
13: 2001:4c08:2005:0:fd01::1 asymm 10 3161.588ms !H
Resume: pmtu 1280
Is there an issue? Is this a known problem? Do we still have a blackholing effect here?
Same problem from Chicago
[carl@mars ~]$ traceroute6 2001:4c08:2005:0:fd08::1
1 2001:470:c27d:d000:2e0:81ff:fe79:f4c4 1.226 ms 0.954 ms 0.792 ms
2 servicespring-1.tunnel.tserv9.chi1.ipv6.he.net 500.907 ms 76.209 ms 47.65 9 ms
3 gige-g3-4.core1.chi1.he.net 55.575 ms 98.477 ms 80.367 ms
4 * * *
5 * * *
^C
Level3 doesn't have a path to HE.NET