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NixOS's dnsmasq module defaults resolveLocalQueries to true, which adds 127.0.0.1 to networking.nameservers and binds dnsmasq to listen-address=127.0.0.1. This made the host route all its own DNS through dnsmasq, which had no-resolv=true and no upstream for anything outside the tailnet domain — so every non-tailscale DNS query from the host itself (including SSSD resolving the IPA server FQDN after the IPA client module was added) failed. Setting resolveLocalQueries=false limits dnsmasq to its intended role: a forwarding proxy reachable on the LAN interface for IPA's conditional forwarder. The host uses domainControllerIp directly (already set in networking.nameservers in host.nix). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>