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Re: I-D Action: draft-west-let-localhost-be-localhost-00.txt

"John R Levine" <johnl@taugh.com> Tue, 27 September 2016 21:19 UTC

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Date: Tue, 27 Sep 2016 17:19:49 -0400
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From: John R Levine <johnl@taugh.com>
To: Emily Shepherd <emily@emilyshepherd.me>
Subject: Re: I-D Action: draft-west-let-localhost-be-localhost-00.txt
In-Reply-To: <20160927211208.zrkp4txdpelw3at4@emily-tablet>
References: <CAKXHy=fCoQPb4EJ2aS9Lfj6yKM-HotjhO_VsPk2PDeFATxpGdg@mail.gmail.com> <20160927184845.5034.qmail@ary.lan> <20160927211208.zrkp4txdpelw3at4@emily-tablet>
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> I'm probably not explaining myself well so I'll give an example. In the setup 
> above, let's say you've set 127.0.1.1 to be your local DNS server, meaning 
> that you might expect the following commands to work:
>      $ dig mysite.localhost
>   mysite.localhost IN A 127.0.0.1
>
>   $ dig myothersite.localhost
>   myothersite.localhost IN A 127.200.200.200
>
> But, under this proposal wouldn't dig be obliged to refuse to forward the 
> request onto 127.0.1.1? How does dig (or your browser or any other resolving 
> API) know the difference between a bog standard caching DNS server and a 
> local DNS server that has explicitly been set up to route local lookups?

I don't see why.  You're allowed to use common sense when interpreting 
RFCs, and the message here is clearly that if you want to interoperate you 
do not send queries for *.localhost out of your computer. The twisty way 
my or your internal DNS setup works is out of scope.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly

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