IPv6-only residential service (MAP, lw4o6)

[Lorenzo Colitti]

On Sun, Dec 7, 2014 at 5:53 AM, Bjørn Mork <bjorn at mork.no> wrote:

> > p.s: 464xlat was never considered because I always thought of it as a
> > mobile solution.
>
> I don't see why. If you can enable some other tunnelling solution on the
> CPE, then 464xlat should also be an option?
>

>From a technical perspective, 464xlat is pretty much the worst. It has all
the disadvantages of DS-Lite, and additionally is less transparent because
translation is lossier than encapsulation.

Its advantages were that it didn't require any protocol work or
provisioning work, and NAT64 implementations already existed, so it was
ready much sooner than everything else. It can be implemented relatively
easily in userspace in hosts. The mobile networks that were under pressure
to go IPv6-only a) already weren't providing transparent IPv4 because they
were using CGN and b) couldn't deploy DS-Lite because the encapsulation
would have broken the DPI mechanisms they used for billing.

Now, of course, it has the advantage that it's fairly widely deployed.

I'd say it's a good fit for mobile networks, but perhaps not so much for
wireline.
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