my ISP does not give v6 to even their business customers even though they could
Heh. I thought you hated v6. Also I've thought about disabling v6 to see if that's what's causing it.
I have a /32 on my home network for an additional 2$.
I assume v4
(I think the way i wrote this is misleading) I have one v4 and 2³² v6