ISP-assigned static IPv6 /48 issues

peter-fyri

I am passed this issue, everything is almost fine, after I added that specific link local, the ISP has sent me. My only problem is that the interface clients don't communicate between each other (for the time being, ping). The internet communicates with them, from anywhere, they communicate with the internet, but not between each other. I mean clients from one interface with clients from another interface. Clients within the same subnet talk to each other just fine.
The very first thing I tried is adding an allow from any to any firewall rule on IPv6 for both interfaces, all protocols, first rule from top to bottom, but nothing..