Re: [v6ops] I-D Action: draft-ietf-v6ops-mobile-device-profile-17.txt - C_REC#9 464XLAT

[Alexandru Petrescu <[e-mail]>]

Le 16/02/2015 11:23, Tore Anderson a écrit :
[...]
> 464XLAT exists entirely inside the customer's device.

What is the name of the software that must exist inside the customer's
device?

> In other words, the operator does not need to configure or provision
>  anything beyond Stateful NAT64 + DNS64 for 464XLAT to function.

But it seems to mandate "464XLAT" to exist inside the customer's device,
for IPv4-literals, and for non-DNS-based apps.

> Stateful NAT64 + DNS64 works just fine without 464XLAT as well, only
>  that IPv4 literals do not work, nor does applications that does not
>  use DNS or that hard-code the use of AF_INET network sockets.

Ok!

I think that an IPv4 access for which IPv4 literals dont work and where
apps MUST use DNS, is not really an IPv4 access.

> I think you've got this the wrong way around. 464XLAT was developed
> to make the IPv6-only APN type work well enough for the general
> populace.

Ok.

I also heard that 464XLAT was imported into the cellular world from DSL 
IPv6 deployments.

> At that point the IPV4V6 APN type didn't really work well enough
> because it was too new and poorly supported, while the IPV6 type is
> older and is well supported.

I can understand that.  The IPv4IPv6 access I used worked just fine for
my applications.  It was 3G+ only, not LTE, but it worked excellent.

> With the advent of LTE networks, this situation is changing.

I can understand that.  LTE networks bring in high bandwidth; but from
the networking point of view there is reason to fear regression (no
more publicly routable IPv4 addresses, no more ping 8.8.8.8, apps must
use DNS, etc).

> My own provider Telenor is now moving from
> IPV6+v4CGN(NAT64/DNS64)+464XLAT to IPV4V6+v4CGN(NAT44), for example.
>  I guess the biggest advantage of this latter approach is that it
> works with Apple devices.

I guess this move is promissing, thanks for mentioning it.

Using IPV4V6 may allow not only Apple devices but may enable more
devices beyond smartphones: machine-class devices and in general all
computers small or large which connect through a dedicated LTE USB key,
or smarter 4G modules.

Alex

>
> Tore
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>