Thanks for your response. Unfortunately IPv6 is a bit more than I am prepared to throw on the current configuration (QNAP server hosting virtual machines and docker containers, oh my). I think I'll stick to dockerizing a DNS server, point LAN clients to it using DHCP, and there host my private domain, forwarding everything else (ie. split-zone DNS configuration, as external to my network the public DNS servers will respond with public addresses). It will probably take me less time to implement this than Swisscom to release new firmware 😐
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