How DoH settings should work

[Vladimir Lomov]

Hello.

I have installed and configured unbound on some of my hosts and wanted to try
DNS-over-HTTPS provided by unbound.

I figured out how to configure unbound (`interface`, `outgoing-interface` and
`access-control`) to use it on the local host and from the local network.

To use DoH, I generated a certificate for DoH and put this in `unbound.conf`:

```
   tls-service-key: "/etc/cert/hosts/doh.key"
   tls-service-pem: "/etc/cert/hosts/doh.crt"
   https-port: 3053
```

But it didn't work, when I did

```
$ dig +https -p 3053 @::1 google.com
```

I got 'connection refused'.

I re-read the documentation carefully and found the following:

```
https-port: <number>

   The port number on which to provide DNS-over-HTTPS service. Only interfaces
   configured with that port number as @number get the HTTPS service.

   Default: 443
```

If get it right, then besides these lines (example!):

```
   interface: ::1
   interface: 127.0.0.1
```

I also need these

```
   interface: ::1 at 3053
   interface: 127.0.0.1 at 3053
```

I added the appropriate lines on three hosts and now `dig +https` works!  But
on the fourth host it works even without these lines! This puzzles me. The
hosts have different network settings, but the fourth host doesn't have a
public IPv6 address, only a ULA one.

So how should DoH be configured? If I change `https-port`, I MUST add
something like
```
   interface: ::1 at PORT
```
or is the `https-port` setting enough?

---
WBR, Vladimir Lomov

-- 
You will not censor me through bug terrorism.
		-- James Troup
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