Re: [v4v6interim] Can we squeeze a tiny topic in the agenda?

On 29/09/2008, at 6:41 PM, Rémi Denis-Courmont wrote:

> On Monday 29 September 2008 10:41:57 ext Andrei Robachevsky, you  
> wrote:
>> Colleagues,
>>
>> I know the agenda is already very full, but I wonder if we could  
>> squeeze
>> a small topic.
>>
>> Coming from the RIR side I'd like to bring up an issue of usability  
>> of
>> the former class E space (240/4). I know many are sceptical about  
>> this,
>> but I am not aware of any more or less comprehensive usability tests.
>> I'd like to discuss the feasibility of such experiment.
>
> Linux (until very recently) and Windows 2000/XP will refuse to send  
> any
> traffic to an address in that range. Also last time I checked, the  
> *BSD
> kernel routing would discard these destinations, such that you  
> cannot cross a
> BSD-based router, although BSD "network leaves" can apparently use  
> them
> (should include OSX). Symbian seems to accept it (not well tested).
> Haven't checked Windows Vista and 9x, nor big routers.
>
> I think it's fair to say that this range is NOT usable with legacy  
> nodes. I
> suspect the only place you might seriously be able to use it, is  
> between two
> NATs in the double NAT deployment, and even then I'm suspicious.

I refer you to section 3 of draft-fuller-240space-02.txt for a summary  
of the level of support for use of this addresses in hosts as of March  
2008  (its an expired draft -  http://smakd.potaroo.net/ietf/idref/draft-fuller-240space/index.html 
  holds a copy)

   Geoff

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