RE: Thinking differently about the site local problem (was: RE: site local addresses (was Re: Fw: Welcome to the InterNAT...))
"Jeroen Massar" <jeroen@unfix.org> Mon, 31 March 2003 18:13 UTC
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From: Jeroen Massar <jeroen@unfix.org>
To: 'Christian Huitema' <huitema@windows.microsoft.com>, 'Keith Moore' <moore@cs.utk.edu>, alh-ietf@tndh.net
Cc: john-ietf@jck.com, ietf@ietf.org
Subject: RE: Thinking differently about the site local problem (was: RE: site local addresses (was Re: Fw: Welcome to the InterNAT...))
Date: Mon, 31 Mar 2003 20:11:29 +0200
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Christian Huitema wrote: > Well, that is emphatically *NOT* what application developers > do. They do not just observe that it does not work, they try > to work around, e.g. routing messages to a different address, > at a different time, through a third party, or through a > different protocol. Indeed, correctly coded applications will use a getaddrinfo() and then a connect() in a loop until succesful. This will also overcome filtering as all possibilities will be tried on the remote side. Note that 'succesful' here means that it was able to setup a tcp connection. UDP is totally out of the question here. Some applications could also modify 'succesful' to include a 2xx smtp reply etc. and absolute failure to be defined by a 5xx error. The problem is that this doesn't account for the locally-bound IP though. Thus if a host has a 'site-local' and a 'global' IP how does it know how to use which one? Also note that getaddrinfo() is only in use since a couple of years and most programmers are not even aware of it. I would suggest that the applications never bind() to a local address, this is possible for most applications. Then the stack can figure out which address to use for the outgoing connection. Most stacks will currently base this on longest prefix matching. Thus if there is a 'local' scope and the destination address is also in the same 'local' prefix, this address will be used for the connection. Greets, Jeroen
- 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
- Thinking differently about names and addresses Dave Crocker
- 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
- Re: Thinking differently about the site local pro… Keith Moore
- RE: Thinking differently about the site local pro… Brian Zill
- Re: Thinking differently about the site local pro… Fredrik Nyman
- 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
- v6 support (was Re: Thinking differently about th… Keith Moore
- Re: v6 support (was Re: Thinking differently abou… Steven M. Bellovin
- Re: v6 support (was Re: Thinking differently abou… Eric Rosen