Can you paste the output of ifconfig and the commands you used to start the tunnel?
Is your ISP blocking proto41? Is your router?
# ifconfig
eno1 Link encap:Ethernet HWaddr f8:b1:56:cd:d5:1a
inet addr:10.0.102.107 Bcast:10.0.103.255 Mask:255.255.252.0
inet6 addr: 2001:470:d:bb3::1/64 Scope:Global
inet6 addr: fe80::194e:35aa:8817:f95a/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:39178902 errors:0 dropped:1 overruns:0 frame:0
TX packets:31747934 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:7471397493 (7.4 GB) TX bytes:12864750080 (12.8 GB)
Interrupt:20 Memory:f5100000-f5120000
he-ipv6 Link encap:IPv6-in-IPv4
inet6 addr: fe80::40ea:a2de/64 Scope:Link
inet6 addr: 2001:470:c:bb3::2/64 Scope:Global
UP POINTOPOINT RUNNING NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:719 dropped:0 overruns:0 carrier:719
collisions:0 txqueuelen:1
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:31420402 errors:0 dropped:0 overruns:0 frame:0
TX packets:31420402 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:4232322361 (4.2 GB) TX bytes:4232322361 (4.2 GB)
Isn't "ifup he-ipv6" suppose to start the tunnel?
Is your ISP blocking proto41? is there a way to test for this and how do I turn this off on a cisco asa?