My connection uses IPv4 and IPv6 over PPPoE and my ISP sets Google IPs as the default IPv6 DNS servers. I run Pi-hole on Proxmox at 192.168.68.111.

To avoid distributing an IPv6 DNS to clients, I configured IPv6 as SLAAC + RDNSS so clients still get IPv6 addresses, but not a DNSv6.

I also set DNS to point to my Pi-hole, but the BE65 still insists on advertising IPv6 DNS to clients, so they end up like this:

I want the BE65’s DHCP server to send only the Pi-hole’s IPv4 address to my clients. How should I configure it?