Re: [DNSOP] DNSOP Call for Adoption - draft-west-let-localhost-be-localhost

"John Levine" <johnl@taugh.com> Wed, 13 September 2017 02:15 UTC

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Date: 13 Sep 2017 02:15:29 -0000
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From: "John Levine" <johnl@taugh.com>
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Cc: peter.van.dijk@powerdns.com
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Subject: Re: [DNSOP] DNSOP Call for Adoption - draft-west-let-localhost-be-localhost
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In article <63DA2E77-8507-4F25-8684-14EABF9A530E@powerdns.com> you write:
>Since we are doing a draft/RFC on what localhost is and is not, I 
>suggest we put some text in there banning (MUST NOT) the practice of 
>having localhost entries (at least those pointing to 127.0.0.1/::1?) in 
>auth zones. If there is agreement on this I am happy to contribute text. 
>This may mean having to say we are updating RFC 1912.

Believe it or not, there are real non-loopback localhost domain names,
like localhost.reddit.com.

I agree that localhost.<foo> pointing to loopback is generally asking
for trouble, but I am not at this point sufficiently confident that it
is never ever a good idea to say MUST NOT rather than SHOULD NOT.  I
can for example imagine ways that might make some kinds of debugging
easier.

R's,
John