Re: [Doh] Dedicated DoH port

nusenu <nusenu-lists@riseup.net> Thu, 11 April 2019 18:18 UTC

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Date: Thu, 11 Apr 2019 18:17:00 +0000
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Subject: Re: [Doh] Dedicated DoH port
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Tomas Krizek:
> If an admin is already running an https service on the machine, the
> clash with DoH resolver can be quite problematic. In best case scenario,
> the admin runs into an error (not able to bind to port 443 - quite
> cryptical for someone trying to run DNS resolver who's not up to date
> about DoH development). 

I assume knot-resolver will not enable DoH by default anyway and so
it is an explicit step by the administrator to enable DoH, right?
In that case the administrator will read your documentation on how 
to enable the DoH listener and that could say that it uses HTTPS
and HTTPS is on 443.

> Since there is currently no IANA assigned DoH port, I've filed the
> following user port request with IANA to establish a common default that
> could be used among DNS vendors.
> 
> Service Name:         [domain-doh]
> Desired Port Number:  [44353]
> Description:          [DNS query-response protocol over HTTPS]
Since DNS-over-HTTPS is specified to use HTTPS as transport
and 443 has been assigned for HTTPS, I think it would cause more confusion
to assign an additional port since it is still HTTPS.

44353 would be "default DoH port in knot-resolver"
but not "DNS-over-HTTPS" as per RFC8484.

I understand your motivation behind it but I believe
documentation should cover most of the issue and if you really want
to avoid starting if there is something else already binding on
that port you could detect that at startup and refuse to start, no?



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