Yeah. My useless ISP router supports it as well here. But it doesn't work when there's a second router in between. Something to do with Prefix Delegation not wo

Yeah. My useless ISP router supports it as well here. But it doesn't work when there's a second router in between. Something to do with Prefix Delegation not working, supposedly. And the ISP router by itself has zero controls for IPv4 DHCP, and so on, so it's absolutely useless by itself.