How to connect ipv6 to internet ?

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Could you be more precise ?
What is your problem ?

i have internet from ipv4,
can it shared to ipv6 ?

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Do you have IPv4 from ISP and do you want to distribute it as IPv6 in LAN or do you have IPv6 from ISP and the idea is to change it into IPv4 for LAN ?

i have ipv4 from isp and i want to distribute it as ipv6 in mikrotik

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Isn't possible to do.
The router need assign an IPv6 prefix from ISP.
Also, ROS do not support NAT64 and NAT66 yet. Supposedly will be supported in the ROS 7.

You can setup an IPv6 over IPv4 tunnel to some tunnel provider and then route that IPv6 range.

This should get you pointed in the right direction. As said earlier you need a tunnel. Hurricane Electric offers a free service.

https://wiki.mikrotik.com/wiki/Manual:H ... e_for_Home