I have spent 2 days working on this and can not seem to get it working.
6to4 tunnel with local: x.x.x.18 remote: 64.71.128.83
[brianbak@MikroTik] > /ipv6 route print detail
Flags: X - disabled, A - active, D - dynamic,
C - connect, S - static, r - rip, o - ospf, b - bgp, U - unreachable
0 A S dst-address=::/0 gateway=2001:470:1f01:5::1
gateway-status=2001:470:1f01:5::1 reachable via sit1 distance=1
scope=30 target-scope=10
1 A S dst-address=2000::/3 gateway=2001:470:1f01:5::1
gateway-status=2001:470:1f01:5::1 reachable via sit1 distance=1
scope=30 target-scope=10
2 ADC dst-address=2001:470:1f01:5::/64 gateway=sit1
gateway-status=sit1 reachable distance=0 scope=10
[brianbak@MikroTik] > /ipv6 address print detail
Flags: X - disabled, I - invalid, D - dynamic, G - global, L - link-local
0 G address=2001:470:1f01:5::2/64 from-pool="" interface=sit1
actual-interface=sit1 eui-64=no advertise=yes
[brianbak@MikroTik] > /ping 2001:470:1F01:5::1
HOST SIZE TTL TIME STATUS
2001:470:1f01:5::1 timeout
2001:470:1f01:5::1 timeout
[brianbak@MikroTik] > ping 2001:4860:4860::8844
HOST SIZE TTL TIME STATUS
2001:4860:4860::8844 timeout