the "2001::" IP would be the 2601:... IP address used throughout. Once it is specifically routed to the fe80: IP for the host, then ipv6 connectivity works just fine to the 2601 IP (since no neighbor discovery is involved -- it's a link address for nexthop.
I'll make some time to disable the bridge callouts this week. as for ebtables, I'm going to say there aren't any: sudo: ebtables: command not found -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1502238 Title: bridge does not forward neighbor solicitation packets To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1502238/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs