The 2001:0db8:: addresses are reserved for IPv6 documentation. I provided an example of the information you need from your ISP.
2407:xxxx:0:1::2/64 is the WAN IP for our Mikrotik
2407:xxxx:0:1::1/64 is the Gateway for us
I think 2407:xxxx::/60 is the subnet for us. Where to config that subnet in Mikrotik
I’m in quite the same situation here, the ISP isn’t routing the assigned network (in my case it’s a /56) to a specific address.
When I try to ping any public ipv6 address from a /64 subnet of that /56, it get’s correctly routed to the gateway the ISP provided, but they do a Neigbor Solicitation instead of routing the packet to it’s destination. So I think they expect every device to answer with a Neighbor Advertisement, before they route the packet. (which would be completely stupid, who has all their vlans / /64s bridged with the wan interface?!)
In this case I’d need something like ndp proxy for this to work, which is not available on ROS, correct?
I suspect the OP has the same issue as you - the ISP has incorrectly attached the /56 (or /60) subnet directly to their end of the link, rather than routing it via a /64. Whilst it can be worked around with ND proxy on equipment which supports it (Mikrotik don’t), it is still the wrong way to do it. It unfortunately crops up frequently, e.g. this thread https://forums.thinkbroadband.com/fibre/t/4689781-leased-line-ipv6-problem-with-unifi-udm-pro.html
Suggest nicely to your ISP that they read the RIPE document I linked to in an earlier post.
Thanks for your help. Now it works.