[lacnog] [IPv6]Android now supports DHCPv6 PD

Mar Sep 16 09:07:28 -03 2025

Ojo que si lo he entendido bien, lo que permite es asignar prefijos (PD), no direcciones individuales.

La idea va en el sentido de que cada vez hay mas dispositivos que pueden necesitar múltiples direcciones (ejemplo VMs).

Además, esto resuelve uno de los problemas de despliegue de banda ancha por medio de 4G/5G, que con los procedimientos actuales solo permite entregar /64 y no prefijos /48, que es lo que normalmente se debe asignar a un end-site, por mucho que este conectado por celular en lugar de fibra, cable, etc.

Con esto Android permite ser utilizado como SO en routers, que hasta ahora no era posible, por la limitación de no aceptar PD.

Aún así, el problema en el caso de celular es que muchos proveedores de infraestructura de 4G/5G, a pesar de ser parte de los estándares el uso de DHCPv6-PD, no lo implementan. Además, por lo visto incluso hay fabricantes de modems celulares (fabricantes de chips), que por defecto filtran los paquetes DHCPv6 - no tengo claro si es un filtrado “físico”  o puede ser configurado por medio de firmware (actualización del firmware de radio o similar).

Saludos,
Jordi

@jordipalet

> El 16 sept 2025, a las 1:42, Carlos Martinez-Cagnazzo <carlosm3011 en gmail.com> escribió:
> 
> Tan solo 10-15 años de discusiones :-) Pero bienvenido sea, más vale tarde que nunca.
> 
> On Mon, Sep 15, 2025 at 8:36 PM Alejandro Acosta <alejandroacostaalamo en gmail.com <mailto:alejandroacostaalamo en gmail.com>> wrote:
>> Interesante..., ¿alguien que se anime a probarlo y nos comente?.
>> 
>> 
>> 
>> Saludos,
>> 
>> 
>> 
>> 
>> 
>> -------- Forwarded Message --------
>> Subject:	[IPv6]Android now supports DHCPv6 PD
>> Date:	Tue, 16 Sep 2025 08:30:35 +0900
>> From:	Lorenzo Colitti <lorenzo=40google.com en dmarc.ietf.org> <mailto:lorenzo=40google.com en dmarc.ietf.org>
>> To:	6man <6man en ietf.org> <mailto:6man en ietf.org>, v6ops en ietf.org <mailto:v6ops en ietf.org> WG <v6ops en ietf.org> <mailto:v6ops en ietf.org>, dhcwg <dhcwg en ietf.org> <mailto:dhcwg en ietf.org>
>> 
>> FYI, we announced DHCPv6 PD support on Android today:
>> 
>> https://android-developers.googleblog.com/2025/09/simplifying-advanced-networking-with.html
>> 
>> This change should already be live on most Android devices running Android 11 and above. Specifically:
>> RFC 9762: if the P flag is set, the device will ask for a SLAAC-sized prefix, and if it gets it, use it to form addresses. Some devices will also disable SLAAC as per the SHOULD in the RFC. Not all devices will support this because it requires a kernel change which will be rolling out over the coming months. In future releases, we expect that the prefix will be shared with downstream devices, wearable devices, VMs, etc.
>> Heuristic: if the device obtains a default route but not PIO, it will ask for a prefix, and if it gets it, use it to form addresses. This allows DHCPv6-only networks to support Android devices today without having to upgrade their routers to set the P flag.
>> Over the next few months we also plan to roll out support for DHCPv6 address registration (RFC 9686).
>> 
>> I would like to thank everyone who contributed to RFC 9663, RFC 9762 and RFC 9686. We think that DHCPv6 PD is *better* than either SLAAC or IA_NA, because it allows the device to provide end-to-end connectivity to unlimited devices, containers, VMs etc. without scaling load on the network. Plus the prefix can be tracked and managed by the operator, which means that it should be possible to deploy it in networks that require DHCPv6 or that have scaling issues dealing with many addresses. We hope that this will allow at least some enterprise operators to deploy IPv6 to Android devices.
>> 
>> Cheers,
>> Lorenzo
>> _______________________________________________
>> LACNOG mailing list
>> LACNOG en lacnic.net <mailto:LACNOG en lacnic.net>
>> https://mail.lacnic.net/mailman/listinfo/lacnog
>> Cancelar suscripcion: https://mail.lacnic.net/mailman/options/lacnog
> 
> 
> 
> --
> --
> =========================
> Carlos M. Martinez-Cagnazzo
> h <http://cagnazzo.name/>ttp://cagnazzo.me <http://cagnazzo.me/>
> =========================
> _______________________________________________
> LACNOG mailing list
> LACNOG en lacnic.net
> https://mail.lacnic.net/mailman/listinfo/lacnog
> Cancelar suscripcion: https://mail.lacnic.net/mailman/options/lacnog

**********************************************
IPv4 is over
Are you ready for the new Internet ?
http://www.theipv6company.com
The IPv6 Company

This electronic message contains information which may be privileged or confidential. The information is intended to be for the exclusive use of the individual(s) named above and further non-explicilty authorized disclosure, copying, distribution or use of the contents of this information, even if partially, including attached files, is strictly prohibited and will be considered a criminal offense. If you are not the intended recipient be aware that any disclosure, copying, distribution or use of the contents of this information, even if partially, including attached files, is strictly prohibited, will be considered a criminal offense, so you must reply to the original sender to inform about this communication and delete it.

------------ próxima parte ------------
Se ha borrado un adjunto en formato HTML...
URL: <https://mail.lacnic.net/pipermail/lacnog/attachments/20250916/3160d286/attachment-0001.htm>