Re: [Autoconf] RFC 5889 (Was: Call for comments to a new AUTOCONF charter proposal)

Thomas Heide Clausen <thomas@thomasclausen.org> Fri, 23 July 2010 07:47 UTC

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From: Thomas Heide Clausen <thomas@thomasclausen.org>
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To: Alexandru Petrescu <alexandru.petrescu@gmail.com>
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Subject: Re: [Autoconf] RFC 5889 (Was: Call for comments to a new AUTOCONF charter proposal)
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On Jul 23, 2010, at 09:43 , Alexandru Petrescu wrote:

> Le 23/07/2010 07:23, Henning Rogge a écrit :
>> On Thu July 22 2010 21:19:09 Alexandru Petrescu wrote:
>>> Le 22/07/2010 17:41, Dearlove, Christopher (UK) a écrit :
>>>> And then those link local addresses are visible beyond their
>>>> local link.
>>> 
>>> No, my point is not understood.  The link-local addresses are not
>>> visible beyond their local link.
>>> 
>>> When the MRs in LFN--MR--MR--MR--LFN use their link-local
>>> addresses these are not visible beyond their respective local
>>> link.
>> 
>> You just have shown that you don't understand what a wireless MANET
>> (with multihop links, without most people would not consider it a
>> MANET) is.
> 
> Ulrich, I do make efforts to understand what you understand.  PArt of
> this effort is to refrain the temptation of claiming you don't understand what I don't understand.
> 
>> if each of the MRs use a wireless interface, the linklocals WILL BE
>> VISIBLE outside their direct link.
> 
> Well, the link local addresses will not be visible outside their direct
> link, because the different links are on different ESSIDs and moreover
> on different channels.

That is the crux of your misunderstanding. They may, in your case, be -- in most MANET cases, they're not.

Thomas


>  Using wireshark on IP packets on these different
> links shows that the link local addressess are not visible from one link
> to another.
> 
> When you say visible - what do you mean?  I mean "not visible" to the IP
> stack.
> 
>> There is no way to prevent this.
> 
> YEs there is - use different ESSIDs and, for more insurance, use
> different channels and different keys.  That is for WiFi.  For other
> technologies (3G+, LTE, Bluetooth) there are other link layer means such
> as pdp context and more.
> 
>> Because multiple links share interfaces in a non-transitive manner
> 
> Well yes, at link layer level.  But link layers have their protocols
> which help build understandable links to the IP stack.
> 
>> (see http://en.wikipedia.org/wiki/Transitive_relation).
> 
> Uh?
> 
> Alex
> 
>> 
>> Henning Rogge
>> 
> 
>