[ipv6-wg] IPv6 only network at RIPE 68

On 20/mag/2014, at 02:06, Tore Anderson <tore at fud.no> wrote:

> * Philip Homburg
> 
>> Note, I'm talking about the proposal to make the detault meeting 
>> network support 464XLAT. I don't think there is any proposal to make
>> the default meeting network IPv6-only (i.e. without any support for
>> IPv4)
> 
> I don't think you can say that "the network support supports 464XLAT"
> as 464XLAT consists of two components, of which only one (the PLAT, or
> in other words the NAT64 gateway) is implemented in the network. The
> other component, the CLAT, is located on the end-user device itself.

Not necessarily. This picture, taken from rfc6877, shows the general 464XLAT scenario:



                                 +------+
                                 |  v6  |
                                 | host |
                                 +--+---+
                                    |
                                .---+---.
                               /         \
                              /   IPv6    \
                             |  Internet   |
                              \           /
                               `----+----'
                                    |
   +------+   |                 .---+---.                    .------.
   |  v6  +---+   +------+     /         \     +------+     /        \
   | host |   |   |      |    /   IPv6    \    |      |    /   IPv4   \
   +------+   +---+ CLAT +---+   Network   +---+ PLAT +---+  Internet  |
   +--------+ |   |      |    \           /    |      |    \           /
   | v4p/v6 +-+   +------+     `---------'     +------+     `----+----'
   |  host  | |                                                  |
   +--------+ |                                               +--+---+
   +------+   |                                               | v4g  |
   | v4p  +---+                                               | host |
   | host |   |                                               +------+
   +------+   |

          <- v4p -> XLAT <--------- v6 --------> XLAT <- v4g ->

     v6  : Global IPv6
     v4p : Private IPv4
     v4g : Global IPv4

                    Figure 1: Wireline Network Topology


The CLAT must not necessarily stay on end-user devices, because it may also be in a box at the border of a dual-stack customer network. On the other hand, I have to agree that this setup is useless for the purpose of offering to participants the experience of an IPv6-only world (actually, they would continue to experience dual-stack). On the other hand, this setup could be useful to convince the operators that, even if they eliminate IPv4 from their backbones, their customers may still continue to have IPv4 as usual.

--
Marco Sommani
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