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

Emily Shepherd <emily@emilyshepherd.me> Mon, 26 September 2016 23:39 UTC

Return-Path: <emily@emilyshepherd.me>
X-Original-To: ietf@ietfa.amsl.com
Delivered-To: ietf@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EC36012B05C; Mon, 26 Sep 2016 16:39:59 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.001
X-Spam-Level:
X-Spam-Status: No, score=-2.001 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=emilyshepherd.me
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Uca4NDvAxptr; Mon, 26 Sep 2016 16:39:58 -0700 (PDT)
Received: from lucy.sweeb.net (lucy.sweeb.net [139.162.207.199]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 13F8912B017; Mon, 26 Sep 2016 16:39:55 -0700 (PDT)
Received: by lucy.sweeb.net (Postfix, from userid 115) id 1B2E01F430; Tue, 27 Sep 2016 00:39:48 +0100 (BST)
Authentication-Results: lucy.sweeb.net; dkim=pass reason="1024-bit key; unprotected key" header.d=emilyshepherd.me header.i=@emilyshepherd.me header.b=hdzX9r0Z; dkim-adsp=pass; dkim-atps=neutral
Received: from emily-tablet (host81-157-247-194.range81-157.btcentralplus.com [81.157.247.194]) by lucy.sweeb.net (Postfix) with ESMTPSA id C28141F418; Tue, 27 Sep 2016 00:39:47 +0100 (BST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=emilyshepherd.me; s=mail; t=1474933187; bh=8+uxFvYvHGmXk6HDXPA03JGukIao9AD2vO3u5+RAx5M=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hdzX9r0ZHvEcAgl48Q9UkUbhmaL3vRbWyJaNw2FNi+25IGX0tUDq+hgzFG1Wmy8YR rvgf7MbTNforxOOfk3yHZUe8N7t/sBIe51Ruaw1C613aI1bBaJpjGLi3PoCOpCKYIf 6pnqgKyAmXhD2iFrpJ+x89oZDLdlKAcxzyW+qjHY=
Date: Tue, 27 Sep 2016 00:39:38 +0100
From: Emily Shepherd <emily@emilyshepherd.me>
To: ietf@ietf.org
Subject: Re: I-D Action: draft-west-let-localhost-be-localhost-00.txt
Message-ID: <20160926233938.k5nsfgxxhpoqzzbk@emily-tablet>
References: <147492207250.5121.3453453957391816595.idtracker@ietfa.amsl.com>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="7do2qi3udj7uigc7"
Content-Disposition: inline
In-Reply-To: <147492207250.5121.3453453957391816595.idtracker@ietfa.amsl.com>
User-Agent: Mutt/1.6.0.1 (2016-04-01)
Archived-At: <https://mailarchive.ietf.org/arch/msg/ietf/o8eoUW8kUai59Nlsokpptv-9ykQ>
Cc: draft-west-let-localhost-be-localhost@ietf.org
X-BeenThere: ietf@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: IETF-Discussion <ietf.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ietf>, <mailto:ietf-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/ietf/>
List-Post: <mailto:ietf@ietf.org>
List-Help: <mailto:ietf-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ietf>, <mailto:ietf-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 26 Sep 2016 23:40:00 -0000

Seems sensible to me.

As this proposal is in the name of consistency, is there an argument we 
should be strict and explicitly define *which* loopback address DNS 
servers must return when queried?

Also, as a nit-picky caveat: might there be a special case worth 
considering when a system is running a caching DNS server locally? In 
that case, it could theoretically be acceptable for a name resolution 
API / library to forward on the request.

> 2.  Item #4 is changed to read as follows:
>
>     Caching DNS servers MUST recognize localhost names as special,
>     and MUST NOT attempt to look up NS records for them, or otherwise
>     query authoritative DNS servers in an attempt to resolve
>     localhost names.  Instead, caching DNS servers 

Are we missing a 'MUST,' on the end of that last line?

Emily

-- 
Emily Shepherd
Computer Science Graduate, MEng (Hons)
W: https://emilyshepherd.me/
M: +44(0)7575 721 231