Re: Thinking differently about the site local problem (was: RE: site local addresses (was Re: Fw: Welcome to the InterNAT...))
Keith Moore <moore@cs.utk.edu> Wed, 02 April 2003 17:07 UTC
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Date: Wed, 02 Apr 2003 12:03:37 -0500
From: Keith Moore <moore@cs.utk.edu>
To: John C Klensin <john-ietf@jck.com>
Cc: moore@cs.utk.edu, bmanning@ISI.EDU, ietf@ietf.org
Subject: Re: Thinking differently about the site local problem (was: RE: site local addresses (was Re: Fw: Welcome to the InterNAT...))
Message-Id: <20030402120337.7284bb8f.moore@cs.utk.edu>
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> (i) RFC 2821 can be read (and was intended to be read) > to prohibit the use of an address literal in a HELO or > EHLO command unless the relevant host has no DNS name. > (sections 3.6, 4.1.1.1, 4.1.4) these days it's sort of odd to think that a host has a distinguished DNS name - hosts quite ordinarily have either an emphemeral DNS name, multiple DNS names, or no DNS name. > (ii) The use of address literals is described as a > mechanism to bypass a barrier, not one for normal use > (RFC2821, section 4.1.3) right. about the only reasonable use of an address literal is for testing, or to reach the postmaster at a particular host associated with a particular address (since "postmaster" is the only address that is guaranteed to be valid when associated with an address literal - and even this is often not true in practice) > (iii) On the other hand, the address literal "should" > still be provided in the From clause of a Received > field. Received field information is expected to not be > picked up by other software and protocols, but the > inclusion of address information there is very > leak-friendly. this is different than using address literals in addresses. email addresses are defined relative to DNS names because you cannot properly send mail to an email address without an MX lookup. OTOH MTAs are still expected to be hosts with addresses. > > of course it is possible to write apps that do not use DNS, > > but this is rarely done. > > Yep. And as pointed out earlier, we have pushed back strongly > against such protocol proposals and implementations. many apps that are used in practice are not standardized; we need to be careful about believing that what's good for standard apps is good for every app. I could certainly make a case for some apps to have their own naming systems and their own name-to-address lookup mechanisms independent of DNS, or more generally, for alternate means of mapping resource names (say URNs) to IP addresses that did not involve DNS names or DNS queries. But it's difficult to believe that such apps would not employ DNS names at all - if nothing else, for initial configuration.
- RE: Thinking differently about the site local pro… Michel Py
- RE: Thinking differently about the site local pro… Christian Huitema
- Re: Thinking differently about the site local pro… Keith Moore
- RE: Thinking differently about the site local pro… Margaret Wasserman
- RE: Thinking differently about the site local pro… Jeroen Massar
- RE: Thinking differently about the site local pro… Vernon Schryver
- RE: Thinking differently about the site local pro… Tony Hain
- Re: Thinking differently about the site local pro… Eliot Lear
- Re: Thinking differently about the site local pro… Valdis.Kletnieks
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- Re: Thinking differently about the site local pro… Måns Nilsson
- Re: Thinking differently about the site local pro… Stephen Sprunk
- RE: Thinking differently about the site local pro… Margaret Wasserman
- Re: Thinking differently about the site local pro… Keith Moore
- Re: Thinking differently about the site local pro… Keith Moore
- RE: Thinking differently about the site local pro… Jeroen Massar
- Re: Thinking differently about the site local pro… Matt Crawford
- Re: Thinking differently about the site local pro… Matt Crawford
- RE: Thinking differently about the site local pro… Michel Py
- Re: Thinking differently about the site local pro… Keith Moore
- Re: Thinking differently about the site local pro… Keith Moore
- Re: Thinking differently about the site local pro… Keith Moore
- Re: Thinking differently about the site local pro… Valdis.Kletnieks
- Re: Thinking differently about the site local pro… Matt Crawford
- RE: Thinking differently about the site local pro… John C Klensin
- RE: Thinking differently about the site local pro… Jeroen Massar
- Re: Thinking differently about the site local pro… Keith Moore
- Re: Thinking differently about the site local pro… Keith Moore
- RE: Thinking differently about the site local pro… Tony Hain
- Re: Thinking differently about the site local pro… Valdis.Kletnieks
- RE: Thinking differently about the site local pro… Jeroen Massar
- RE: Thinking differently about the site local pro… Jeroen Massar
- Re: Thinking differently about the site local pro… Keith Moore
- Re: Thinking differently about the site local pro… S Woodside
- RE: Thinking differently about the site local pro… Michel Py
- RE: Thinking differently about names and addresses Tony Hain
- Re: Thinking differently about names and addresses Dave Crocker
- site locals are bankrupt Keith Moore
- Re: Thinking differently about names and addresses John C Klensin
- Re: Thinking differently about names and addresses Harald Tveit Alvestrand
- Re: Thinking differently about the site local pro… John Stracke
- RE: Thinking differently about names and addresses Tony Hain
- Re: Thinking differently about the site local pro… John Stracke
- Re: Thinking differently about the site local pro… J. Noel Chiappa
- Re: Thinking differently about the site local pro… J. Noel Chiappa
- Re: Thinking differently about names and addresses Keith Moore
- Re: Thinking differently about names and addresses Dave Crocker
- Re: Thinking differently about names and addresses Dave Crocker
- Re: Thinking differently about the site local pro… Keith Moore
- RE: Thinking differently about names and addresses Tony Hain
- Re: Thinking differently about names and addresses Keith Moore
- Re: Thinking differently about the site local pro… Bill Manning
- Re: Thinking differently about the site local pro… Michael Richardson
- Re: Thinking differently about the site local pro… Pekka Savola
- Re: Thinking differently about the site local pro… Harald Tveit Alvestrand
- RE: Thinking differently about the site local pro… Jeroen Massar
- RE: Thinking differently about the site local pro… Spencer Dawkins
- Re: Thinking differently about the site local pro… Keith Moore
- RE: Thinking differently about the site local pro… Jeroen Massar
- Re: Thinking differently about the site local pro… Bill Manning
- Re: Thinking differently about the site local pro… Keith Moore
- Re: Thinking differently about the site local pro… Keith Moore
- Re: Thinking differently about the site local pro… Keith Moore
- RE: Thinking differently about the site local pro… Jeroen Massar
- Re: Thinking differently about the site local pro… John C Klensin
- RE: Thinking differently about the site local pro… Jeroen Massar
- Re: Thinking differently about the site local pro… Keith Moore
- Re: Thinking differently about the site local pro… Randy Bush
- RE: Thinking differently about the site local pro… Tony Hain
- RE: Thinking differently about the site local pro… Daniel Senie
- RE: Thinking differently about the site local pro… Jeroen Massar
- RE: Thinking differently about the site local pro… Jeroen Massar
- RE: Thinking differently about the site local pro… Jeroen Massar
- RE: Thinking differently about the site local pro… Tony Hain
- Re: Thinking differently about the site local pro… John Stracke
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- RE: Thinking differently about the site local pro… Brian Zill
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- RE: Thinking differently about the site local pro… Jeroen Massar
- RE: Thinking differently about the site local pro… Margaret Wasserman
- RE: Thinking differently about the site local pro… Jeroen Massar
- Re: Thinking differently about the site local pro… John Stracke
- Re: Thinking differently about the site local pro… Keith Moore
- Re: Thinking differently about the site local pro… John Stracke
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