No Route to Host: OpenBSD, Tailscale, resolvd, and unwind

It started with something that should never break: doas pkg_add -u . &ldquo;No route to host&rdquo; pkg_add started failing for every single package with ftp: connect: No route to host . The mirror, cdn.openbsd.org , resolved fine. It resolved to both an IPv4 and an IPv6 address. The problem was the IPv6 one: my router publishes a Tailscale-assigned IPv6 nameserver, the resolver returns an AAAA…