[grobj] NATs and scope

Brian E Carpenter <brian.e.carpenter@gmail.com> Thu, 19 November 2009 20:21 UTC

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Date: Fri, 20 Nov 2009 09:21:33 +1300
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: Simon Perreault <simon.perreault@viagenie.ca>
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Cc: grobj@ietf.org
Subject: [grobj] NATs and scope
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On 2009-11-20 03:11, Simon Perreault wrote:

> - The "scope" of an address (I'm still not fully understanding the concept) does
> not guarantee that that the address is reachable from anyone in that scope. For
> example, the address of a NAT binding (called a "reflexive transport address" in
> RFC5389) can be reached by a subset of peers in the NAT's scope which depends on
> the type of NAT (see e.g. RFC4787 for types of NATs).

So, given what I just said about scope (with no reference to NATs), I think
Simon needs to tell us what he means by "in the NAT's scope".

To me an address scope is a set of mutually reachable addresses, which
means that a NAT automatically forms (part of) the boundary of a scope.
I don't understand what is meant by "a subset of peers" - surely all
the peers behind a given NAT (more precisely, behind a given interface
of a given NAT) are in the same address space?

   Brian

Re: [grobj] Problem statement bo zhou
Re: [grobj] Problem statement Brian E Carpenter
[grobj] Problem statement Simon Perreault
Re: [grobj] Problem statement Scott Brim
Re: [grobj] Problem statement bo zhou
Re: [grobj] Problem statement Simon Perreault
Re: [grobj] Problem statement Dan Wing
Re: [grobj] Problem statement Simon Perreault
Re: [grobj] Problem statement Dan Wing
Re: [grobj] Problem statement Simon Perreault
Re: [grobj] Problem statement Dan Wing
Re: [grobj] Problem statement Joel Halpern
[grobj] Value and meaning of scope Brian E Carpenter
[grobj] NATs and scope Brian E Carpenter
[grobj] Trying all addresses Brian E Carpenter
Re: [grobj] NATs and scope Dan Wing
Re: [grobj] NATs and scope Simon Perreault
Re: [grobj] NATs and scope Brian E Carpenter
Re: [grobj] Trying all addresses Keith Moore
Re: [grobj] Trying all addresses Dong Zhang
Re: [grobj] Trying all addresses Brian E Carpenter
[grobj] FW: [Fwd: Re: Problem statement] Sheng Jiang