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Re: [v6ops] I-D Action: draft-ietf-v6ops-6to4-to-historic-07.txt

Alexandru Petrescu <alexandru.petrescu@gmail.com> Thu, 13 November 2014 22:14 UTC

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Date: Thu, 13 Nov 2014 23:10:50 +0100
From: Alexandru Petrescu <alexandru.petrescu@gmail.com>
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To: Doug Barton <dougb@dougbarton.us>, Gert Doering <gert@space.net>, Ole Troan <otroan@employees.org>
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Subject: Re: [v6ops] I-D Action: draft-ietf-v6ops-6to4-to-historic-07.txt
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Le 13/11/2014 21:03, Doug Barton a écrit :
> On 11/13/14 11:59 AM, Gert Doering wrote:
>> Hi,
>>
>> On Thu, Nov 13, 2014 at 09:52:48AM -1000, Ole Troan wrote:
>>> it certainly would be interesting to hear what existing use cases
>>> there are for peer to peer mode 6to4 (as in without relays). I also
>>> have a hard time understanding the usefulness of keeping any of it.
>>
>> Well, access to hosts behind a router with one global IPv4 address and
>> a 6to4 gateway in it comes to mind - without having to configure explicit
>> NAT mappings on the router.  I think this is Keith's scenario.
>>
>> (Client has working global IPv4, Router has working global IPv4, neither
>> has v6, but peer-to-peer 6to4 enables access to inside LAN with 2002:
>> addresses derived from Router's v4 address)
>
> Isn't that the use case that ULAs are meant to cover? Or am I missing
> something here?

I agree.  But when confronted to a similar situation I missed a 
description in the ULA RFC which tells how to form an IPv6 prefix out of 
an IPv4 address. (section 3.2.2 code for pseudo-rqndmo globql ID).

Alex

>
> I made the point earlier that (for example) OpenWRT already has support
> for PD, it also creates a ULA network on the LAN side, whether you have
> a public prefix (or tunnel) or not. So all of that is doable today, with
> running code.
>
> Doug
>
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