Re: IPv4 flag day

["jordi.palet--- via NANOG" <nanog () lists nanog org>]

For some reason, many operators do not realize that 464XLAT is not just for mobile networks.

They also miss that if they have a network that offers mobile and fix broadband, it make sense, if they are providing 
backup, to use 464XLAT in both networks, so having the same transition mechanism provides much better customer 
experience, flexibility for the operator and of course reduce CapEx and OpEx.

I guess the main reason to use MAP-T/E is because, the ISP network don’t have state, but this is at the cost of needed 
to share pre-defined ports per customer, and making your addressing plan somehow depending on the protocol. This way 
the utilization of IPv4 public addresses is not the best.

https://www.rfc-editor.org/info/rfc9313/

Of course MAP-T has 3 translations, so a big ugglier.

Regards,
Jordi

@jordipalet

> El 18 jun 2026, a las 8:07, Vincent Bernat <bernat () luffy cx> escribió:
>
> On 2026-06-17 08:48, jordi.palet--- via NANOG wrote:
>
> > T-Mobile for example, got CPEs with CLAT that provide broadband via 3G/4G/5G, but in general I don’t see other big 
> > players pushing the vendors for that. We really must change that if we want to move on. Why we want competition if 
> > we don’t ask them to support the standards? or we just believe the CPE is a disposable cost and because that, we 
> > spend more CapEx and OpEx in other parts of the network because the lack of vision when asking for CPEs?
>
> In France, new broadband deployments are done with custom CPEs supporting CLAT. Free is using MAP-E. Bouygues is 
> using MAP-T. SFR should also start using MAP-T, but this is unclear (for me) if they are moving beyond the tests. And 
> Orange started deploying DS-Lite.
>
> On the mobile front, I don't know exactly, but I suppose many are doing 464XLAT, which is what is supported on both 
> iOS and Android. There is one exception that is still doing NAT44, but the function can be colocated with the UPF and 
> does not need to be very distributed.



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