Note: I'm not a network expert, and I don't have deep knowledge about IPv6.
Recently, IPv6 connectivity seems not to be working here. (Tested through Firefox)
The funny thing are, when doing a traceroute:
-it seems like EVERY IPv6 site (I've tested around 30 from different locations around the world) goes through Level3 servers/network/routers;
-it seems like IPv6 packets can't pass Level3 servers/network/routers;
-for a same host using IPv4 instead, traffic passes by other networks, like Sprint (sl-mst30-mia-hu0-5-0-2.sprintlink.net [160.81.164.85]), for example;
See two examples below: (note IPv6 2001:450:2001:1000:0:67:1716:8158 in the traceroute is from Level 3 network. See this to check it out)
www.ipv6forum.com
Tracing route to www.ipv6forum.com [2001:a18:1:20::42]
over a maximum of 99 hops:
1 <1 ms <1 ms <1 ms 2604:XX8X:c98e:6f11:XXXX:XXXX:XXXX:XXXX
2 2 ms 2 ms 1 ms 2604:XX8X:f000:a111::86
3 2 ms 1 ms 2 ms 2604:XX8X:f010:207::1
4 2 ms 2 ms 2 ms 2604:XX8X:f010:149::2
5 2 ms 2 ms 2 ms 2604:XX8X:f010:190::1
6 2 ms 2 ms 2 ms 2604:4XX:ffff:f3f6::1
7 121 ms 121 ms 121 ms 2001:450:2001:1000:0:67:1716:8158
8 * * * Request timed out.
9 * 219 ms 220 ms lo-0-v6.ear2.Frankfurt1.Level3.net [2001:1900:2::3:111]
10 * * * Request timed out.
11 * * * Request timed out.
...
99 * * * Request timed out.
www.avis.ad.jp
Tracing route to www.avis.ad.jp [2406:8000:101:c020::2c]
over a maximum of 99 hops:
1 1 ms <1 ms <1 ms 2604:XX8X:c98e:6f11:XXXX:XXXX:XXXX:XXXX
2 2 ms 1 ms 1 ms 2604:XX8X:f000:a111::86
3 2 ms 13 ms 2 ms 2604:XX8X:f010:207::1
4 2 ms 2 ms 2 ms 2604:XX8X:f010:149::2
5 2 ms 2 ms 2 ms 2604:XX8X:f010:190::1
6 2 ms 2 ms 2 ms 2604:4XX:ffff:f3f6::1
7 121 ms 121 ms 121 ms 2001:450:2001:1000:0:67:1716:8158
8 * * * Request timed out.
9 141 ms 140 ms 140 ms lo-0-v6.ear1.Washington12.Level3.net [2001:1900::3:187]
10 * * * Request timed out.
11 * * * Request timed out.
...
99 * * * Request timed out.
However, if I access a level3 page, it works! (Tested through Firefox)
ipv6.test.level3.com
Tracing route to ipv6.test.level3.com [2001:1900:2018:3000::105]
over a maximum of 99 hops:
1 <1 ms <1 ms <1 ms 2604:XX8X:c98e:6f11:XXXX:XXXX:XXXX:XXXX
2 2 ms 1 ms 1 ms 2604:XX8X:f000:a111::86
3 5 ms 2 ms 2 ms 2604:XX8X:f010:207::1
4 2 ms 2 ms 2 ms 2604:XX8X:f010:149::2
5 2 ms 2 ms 2 ms 2604:XX8X:f010:190::1
6 2 ms 2 ms 2 ms 2604:4XX:ffff:f3f6::1
7 121 ms 120 ms 120 ms 2001:450:2001:1000:0:67:1716:8158
8 * * * Request timed out.
9 161 ms 160 ms 162 ms lo-0-v6.ear1.Denver1.Level3.net [2001:1900::3:154]
10 165 ms 161 ms 161 ms fe0-0-956.public2.Broomfield1.Level3.net [2001:1900:4:2::fa]
11 161 ms 160 ms 161 ms 2001:1900:2018:f000:1:0:1:202
12 161 ms 161 ms 161 ms ipv6.test.Level3.com [2001:1900:2018:3000::105]
Trace complete.
So, is there something I can do to fix it?
Or is it a problem in the Level3.net network?
(I know I can use IPv4 (in some cases), but I want to understand why IPv6 doesn't work)
XX04
, likely not), while leaving in potentially privacy compromising information (like the MAC address of your end device). Please edit the question, provide the initial XXs, and insert some XXs at the end (if you have to). If you indeed don't get a public IPv6 address, then the reason is that this address is not routable outside the Level3 network, and apparently they don't do NAT.