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Re: 2821 and friends (Re: draft-eastlake-2606bis-00.txt: Suggestions for modifications)

"Eric A. Hall" <ehall@ehsco.com> Thu, 20 October 2005 17:16 UTC

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Date: Thu, 20 Oct 2005 13:13:22 -0400
From: "Eric A. Hall" <ehall@ehsco.com>
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To: Harald Tveit Alvestrand <harald@alvestrand.no>
CC: Paul Vixie <paul@vix.com>, namedroppers@ops.ietf.org
Subject: Re: 2821 and friends (Re: draft-eastlake-2606bis-00.txt: Suggestions for modifications)
References: <200510201117.j9KBHYb6033105@drugs.dv.isc.org> <500955810D4CE03A82D7FC9C@svartdal.hjemme.alvestrand.no> <a06200701bf7d3958f4b4@[192.168.1.101]> <72E3B614EE413656376A863B@svartdal.hjemme.alvestrand.no> <20051020141307.99E4A11426@sa.vix.com> <209FCC95A2DF6AF7E4B6CF5F@svartdal.hjemme.alvestrand.no> <20051020161201.9A6E411425@sa.vix.com> <EFF8BEB7F4A41259363ECCF2@svartdal.hjemme.alvestrand.no>
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On 10/20/2005 12:39 PM, Harald Tveit Alvestrand wrote:
> Changing the subject on this particular tangent....
> 
> --On torsdag, oktober 20, 2005 16:12:01 +0000 Paul Vixie <paul@vix.com> 
> wrote:
> 
> 
>># hta@[129.241.1.99] is a valid email address. hta@129.241.1.99 isn't.
>># Some mailers get it right, some don't.
>>
>>really?  i know that mailnames used to have to start with non-numeric, but
>>3com.com asked for a change and got it.  do the current (2821/2822)
>>railroad diagrams really say that 129.241.1.99 is not a valid mailname?
> 
> 
> RFC 2821:

It should also be pointed out that even though labels may contain numbers,
the entire hostname sequence is expected to contain at least one letter.
This is spelled out in the requirements prior to the relaxation in
rfc1123, but its also confirmed in 1123 itself

           If a dotted-decimal number can be entered without such
           identifying delimiters, then a full syntactic check must be
           made, because a segment of a host domain name is now allowed
           to begin with a digit and could legally be entirely numeric
           (see Section 6.1.2.4).  However, a valid host name can never
           have the dotted-decimal form #.#.#.#, since at least the
           highest-level component label will be alphabetic.

-- 
Eric A. Hall                                        http://www.ehsco.com/
Internet Core Protocols          http://www.oreilly.com/catalog/coreprot/

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