I hope I’m not adding to any confusion. I find this conversation to be interesting and want it to be productive. I have not deployed 464XLAT and am only aware of android phones having a proper client.

I have worked with so many CPE devices and know that most have solid deployments of the required CLAT client. I also predict this will not change any time soon. I live in “actually works and is solid” world. Not in “I wish this would work” world.





> On Aug 27, 2020, at 2:50 AM, Mark Andrews <marka@isc.org> wrote:

>

>

>

>> On 27 Aug 2020, at 17:33, Brian Johnson <brian.johnson@netgeek.us> wrote:

>>

>> If an ISP provides dual-stack to the customer, then the customer only uses IPv4 when required and then will only use NAT444 to compensate for a lack of IPv4 address space when an IPv4 connection is required. What am I missing?

>

> Lots of assumptions people are making about how equipment is configured which is causing people to talk past each other.

>

>>> On Aug 27, 2020, at 1:20 AM, Mark Andrews <marka@isc.org> wrote:

>>>

>>>

>>>

>>>> On 27 Aug 2020, at 15:58, Bjørn Mork <bjorn@mork.no> wrote:

>>>>

>>>> Brian Johnson <brian.johnson@netgeek.us> writes:

>>>>

>>>>>> 1) It needs *much less* IPv4 addresses (in the NAT64) for the same number of customers.

>>>>>

>>>>> I cannot see how this is even possible. If I use private space

>>>>> internally to the CGN, then the available external space is the same

>>>>> and the internal customers are the same and I can do the same over sub

>>>>> ratio under both circumstance. Tell me how the math is different.

>>>>

>>>> Because NAT64 implies DNS64, which avoids NATing any dual stack service.

>>>> This makes a major difference today.

>>>

>>> Only if you don’t have a CLAT installed and for home users that is suicide

>>> at there is too much IPv4 only equipment.

>>>

>>> What really pushes traffic to IPv6 is that hosts prefer IPv6 by default.  This

>>> works as long as the clients see a dual stack network.

>>>

>>> And no NAT64 does not imply DNS64.  You can publish a ipv4only.arpa zone with

>>> the mappings for the NAT64.  There are now also RA options for publishing these

>>> mappings.  There are also DHCPv6 options.

>>>

>>> Mark

>>>

>>>> Bjørn

>>>

>>> --

>>> Mark Andrews, ISC

>>> 1 Seymour St., Dundas Valley, NSW 2117, Australia

>>> PHONE: +61 2 9871 4742              INTERNET: marka@isc.org

>>>

>>

>

> --

> Mark Andrews, ISC

> 1 Seymour St., Dundas Valley, NSW 2117, Australia

> PHONE: +61 2 9871 4742              INTERNET: marka@isc.org

>