On Windows, primary nameserver (127.0.0.1) is sorted after secondary nameserver

[spazmodius]

Environment

Windows 10
c-ares 1.18.1 (I think, as included in Node.js v16.14.0)

Setup

My Primary DNS server configures for 127.0.0.1, a local instance of SmartDns. My secondary DNS server is my ISP's.

Problem

ares_get_servers_ports sorts my nameservers in reverse of preference, and uses my ISP's server for resolution instead of my local server.

Why

GetBestRoute2 for 127.0.0.1 on my wifi interface returns ERROR_INVALID_PARAMETER, thus that server gets assigned the worst possible metric.

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First reported to nodejs

[nanonyme]

Usually when I see this kind of local DNS setups, there is nothing else configured in DNS except the local IP. So alternative address would be 0.0.0.0.