Hello,
Have three nodes with IPv6, 1- Teredo, 1 - Tunnel Broker 6in4, 1 - ISP Native IPv6.
From the TunnelBroker 6in4 can establish an ssh connection to the node using Teredo.
From the ISP to the Teredo node is not accessible.
In looking at the traceroute from the ISP IPv6 to the Teredo node it looks like the traffic gets dropped at a HE.net router.
$ traceroute6 2001:0:53aa:64c:49:7c32:b05f:XXXX
traceroute to 2001:0:53aa:64c:49:7c32:b05f:XXXX (2001:0:53aa:64c:49:7c32:b05f:XXXX), 30 hops max, 80 byte packets
1 2603-9000-9203-1600-f60e-83ff-fe97-f623.res.spectrum.com (2603:9000:9203:1600:f60e:83ff:fe97:f623) 2.623 ms 41.485 ms 3.849 ms
2 2603-9000-ff00-0092-0000-0000-0000-0001.res.spectrum.com (2603:9000:ff00:92::1) 19.411 ms 19.467 ms 21.788 ms
3 2607-f098-1000-4000-0000-0000-0000-003b.res6.spectrum.com (2607:f098:1000:4000::3b) 22.433 ms 22.523 ms 22.539 ms
4 2607-f098-1000-4000-0000-0000-0000-01cb.res6.spectrum.com (2607:f098:1000:4000::1cb) 27.627 ms 34.500 ms 36.191 ms
5 2607-f098-10fe-0000-0100-2000-ccc7-006a.res6.spectrum.com (2607:f098:10fe:0:100:2000:ccc7:6a) 29.193 ms * 29.947 ms
6 2607-f098-10fe-0000-0100-2000-c3c3-0075.res6.spectrum.com (2607:f098:10fe:0:100:2000:c3c3:75) 35.998 ms 17.569 ms 26.418 ms
7 2001:1998:0:4::16 (2001:1998:0:4::16) 29.133 ms 2001:1998:0:8::258 (2001:1998:0:8::258) 31.342 ms 2001:1998:0:4::16 (2001:1998:0:4::16) 25.168 ms
8 2001:1998:0:4::189 (2001:1998:0:4::189) 30.645 ms 31.033 ms 30.510 ms
9 10gigabitethernet9-19.core1.mia1.he.net (2001:470:0:386::1) 29.944 ms 29.594 ms 29.158 ms
10 100ge5-2.core1.tpa1.he.net (2001:470:0:2b3::2) 38.837 ms 100ge11-1.core1.atl1.he.net (2001:470:0:18d::1) 46.465 ms 100ge11-1.core1.jax1.he.net (2001:470:0:450::2) 40.327 ms
11 100ge8-1.core1.ash1.he.net (2001:470:0:114::2) 57.381 ms 43.907 ms 44.449 ms
12 100ge8-1.core1.ash1.he.net (2001:470:0:114::2) 47.799 ms 47.878 ms 6to4.ash1.he.net (2001:470:0:136::2) 46.566 ms
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Regards,