[lacnog] [v6ops] Windows CLAT Enters Private Preview: A Milestone for IPv6 Adoption | Microsoft Community Hub
Fernando Gont
fgont en si6networks.com
Dom Nov 23 21:00:03 -03 2025
Hola, Jordi,
Repito: Y las referencias?
Estamos en una lista tecnica. Tiraste "40% de mejora con IPv6". Todavia
no vi una referencia "citable" (*).
(*) citable: Lease, un trabajo con cierto minimo grado de formalisto,
mas alla de un posteo en un blog, o un comentatio en una charla
mencionando "ni pp* idea porque estamos midiendo lo que estamos midiendo".
Thnx,
Fercho
On 23/11/2025 15:29, jordi.palet--- vía LACNOG wrote:
> Y cada vez mas frecuentemente CGN (ida y vuelta).
>
> Saludos,
> Jordi
>
> @jordipalet
>
>
>> El 23 nov 2025, a las 16:51, Alejandro Acosta
>> <alejandroacostaalamo en gmail.com> escribió:
>>
>> Hola Fer,
>>
>> Si, pero recuerda también puede haber NAT64/NAT46 en el otro extremo.
>>
>>
>> Ale,
>>
>>
>> On 23/11/25 11:45 AM, Fernando Gont wrote:
>>> Hola, Henri,
>>>
>>> Hay otra cuestion: Para asegurarse de la causa, el delay extra
>>> deberia medirse en los primeros hops (donde se supone que existe la
>>> diferencia causada por el NAT). SI lo medis e2e, hay pueden existir
>>> otra cantidad de factores.
>>>
>>> Slds,
>>> Fernando
>>>
>>>
>>>
>>>
>>> On 22/11/25 11:01, Henri Alves de Godoy vía LACNOG wrote:
>>>>
>>>> Para quem quiser testar o realizar os testes em suas residências, o
>>>> arquivo curl-format.txt deve ter o conteúdo:
>>>>
>>>> time_namelookup: %{time_namelookup}
>>>> time_connect: %{time_connect}
>>>> time_appconnect: %{time_appconnect}
>>>> time_pretransfer: %{time_pretransfer}
>>>> time_starttransfer:%{time_starttransfer}
>>>> time_total: %{time_total}
>>>> size_download: %{size_download}
>>>> speed_download: %{speed_download}
>>>>
>>>> Att,
>>>> Henri.
>>>>
>>>> Em sáb., 22 de nov. de 2025 às 10:15, jordi.palet--- vía LACNOG
>>>> <lacnog en lacnic.net <mailto:lacnog en lacnic.net>> escreveu:
>>>>
>>>> Gracias Henri,
>>>>
>>>> Solo me queda la duda de si la diferencia puede ser por la WiFi. Yo
>>>> nunca hago pruebas de este tipo con Wifi, siempre con Ethernet,
>>>> porque puede haber variaciones/interferencias en la radio incluso
>>>> con pocos segundos de diferencia.
>>>>
>>>> Eso si, discrepo contigo en que los usuarios no lo notan … te
>>>> aseguro que si, esa es la pelea de los operadores todos los días,
>>>> especialmente con los gammers!
>>>>
>>>> Saludos,
>>>> Jordi
>>>>
>>>> @jordipalet
>>>>
>>>>
>>>>> El 22 nov 2025, a las 14:00, Henri Alves de Godoy
>>>>> <henri.godoy en fca.unicamp.br <mailto:henri.godoy en fca.unicamp.br>>
>>>>> escribió:
>>>>>
>>>>> Bom dia Jordi, Fernando e Alejandro,
>>>>>
>>>>> Aproveitando essa manhã de Sábado ensolarado, realizei um pequeno
>>>>> teste básico a partir de minha residência, link Internet 600Mbps -
>>>>> Operadora Claro, Notebook Windows 11, utilizando Wi-Fi,
>>>>> dual-stack, IPv4 CGNAT. IPv6 global.
>>>>>
>>>>> Como destino está o website da Faculdade de Ciências Aplicadas -
>>>>> UNICAMP - Dual Stack - Apache Server.
>>>>>
>>>>> Comando:
>>>>>
>>>>> curl -4 -L --resolve www.fca.unicamp.br:443:143.106.230.5 `
>>>>> -o NUL -s -w "@curl-format.txt"
>>>>> https://www.fca.unicamp.br/test/10m.bin
>>>>> <https://www.fca.unicamp.br/test/10m.bin>
>>>>>
>>>>> curl -6 -L --resolve www.fca.unicamp.br:443:2801:8a:c040:fca0::5 `
>>>>> -o NUL -s -w "@curl-format.txt"
>>>>> https://www.fca.unicamp.br/test/10m.bin
>>>>> <https://www.fca.unicamp.br/test/10m.bin>
>>>>>
>>>>> Parâmetros analisados:
>>>>>
>>>>> |time_connect|: handshake TCP
>>>>>
>>>>> *
>>>>>
>>>>> |time_appconnect|: handshake TLS (só em HTTPS)
>>>>>
>>>>> *
>>>>>
>>>>> |time_starttransfer| (TTFB): tempo até o primeiro byte
>>>>>
>>>>> *
>>>>>
>>>>> |time_total|: tempo total do download
>>>>>
>>>>> *
>>>>>
>>>>> |speed_download|: throughput final
>>>>>
>>>>> *
>>>>>
>>>>> Resultados:
>>>>>
>>>>> *
>>>>>
>>>>> IPv4
>>>>>
>>>>> *
>>>>>
>>>>> time_connect: 0.032 s
>>>>> time_appconnect: 0.643 s
>>>>> time_starttransfer:0.675 s
>>>>> time_total: 5.923 s
>>>>> speed_download: 1.77 MB/s
>>>>>
>>>>> *
>>>>>
>>>>> IPv6
>>>>>
>>>>> *
>>>>>
>>>>> time_connect: 0.043 s (quase igual ao IPv4)
>>>>> time_appconnect: 0.101 s (mais rapido)
>>>>> time_starttransfer:0.155 s (mais rápido)
>>>>> time_total: 2.14 s (mais rápido)
>>>>> speed_download: 4.89 MB/s
>>>>>
>>>>> *
>>>>>
>>>>>
>>>>> *
>>>>>
>>>>> Analise:
>>>>>
>>>>> *
>>>>>
>>>>>
>>>>> TLS handshake (time_appconnect):
>>>>>
>>>>>
>>>>> IPv4 é 6,3 vezes mais lento no handshake
>>>>>
>>>>> *
>>>>>
>>>>>
>>>>> IPv6: 0.101 s
>>>>>
>>>>> *
>>>>>
>>>>>
>>>>> IPv4: 0.643 s
>>>>>
>>>>> *
>>>>>
>>>>> *
>>>>> Tempo total (time_total):
>>>>> *
>>>>>
>>>>> *
>>>>> IPv4: 5.92 s
>>>>> *
>>>>>
>>>>> *
>>>>> IPv6: 2.14 s
>>>>> *
>>>>>
>>>>> *
>>>>>
>>>>>
>>>>> Throughput final
>>>>>
>>>>> IPv6 está entregando 2,8 vezes mais throughput.
>>>>>
>>>>> *
>>>>>
>>>>>
>>>>> IPv6: 4.89 MB/s
>>>>>
>>>>> *
>>>>>
>>>>>
>>>>> IPv4: 1.77 MB/s
>>>>>
>>>>> *
>>>>>
>>>>> *
>>>>> É claro que é um teste único e seria interessante realizar uma
>>>>> média de várias conexões.
>>>>> *
>>>>>
>>>>> *
>>>>> Os usuários conseguem então ter um experiência melhor de
>>>>> navegação ao consumir o website da Faculdade utilizando IPv6
>>>>> *
>>>>>
>>>>> *
>>>>> Para um usuário normal e leigo, isso pode passar despercebido,
>>>>> pois o objetivo é acessar o website. Para nós profissionais,
>>>>> temos a certeza de que estamos proporcionando um acesso com
>>>>> uma experiência melhor para os nossos alunos e visitantes.
>>>>> *
>>>>>
>>>>> *
>>>>> Abraços !
>>>>> Henri.
>>>>> *
>>>>>
>>>>>
>>>>> Em sáb., 22 de nov. de 2025 às 07:07, jordi.palet--- vía LACNOG
>>>>> <lacnog en lacnic.net <mailto:lacnog en lacnic.net>> escreveu:
>>>>>
>>>>> Hola Henri, Fernando,
>>>>>
>>>>> Creo que hablamos de diferentes mediciones … se trata de
>>>>> comparar IPv6 nativo extremo a extremo (por ejemplo
>>>>> residencial con IPv6-only y Facebook) con usuario residencial
>>>>> que, en el mismo operador y con los mismos dispositivo (para
>>>>> que sea comparable), tenga solo IPv4 y accede al mismo
>>>>> contenido.
>>>>>
>>>>> He encontrado un paper, que quizás “contente" a Fernando,
>>>>> seguramente hay muchos otros (yo recuerdo haber leído otros de
>>>>> Akamai, Facebook y T-Mobile, pero ahora mismo no doy con ellos:
>>>>>
>>>>> https://www.moritzsteiner.de/papers/Mobicom_IPv6.pdf
>>>>> <https://www.moritzsteiner.de/papers/Mobicom_IPv6.pdf>
>>>>>
>>>>> Lo he leído solo por encima, y no me queda claro si son las
>>>>> mismas pruebas que yo he hecho, parece que al menos son
>>>>> cercanas y comparables, solo que en red mobil. En este caso
>>>>> compara casos de diferentes operadores y muestra diferencias
>>>>> importantes entre ellos (por eso yo hago estas pruebas en mis
>>>>> despliegues, para asegurar que es óptimo). Por ejemplo en el
>>>>> caso de Verizon (el mejor de todos), incluso supera ese 40%
>>>>> que yo indicaba y copio textualmente:
>>>>>
>>>>> In Figure 7(b), we observe similar reductions in PLTs for
>>>>> pages loaded by Verizon’s IPv6 clients over Verizon’s IPv6
>>>>> network. Specifically, we show that the median and 80% of the
>>>>> PLTs by IPv6 clients over Verizon’s IPv6 network are 48% and
>>>>> 64% faster than PLTs over its IPv4 network, because of the
>>>>> significant differences in RTTs between Verizon’s IPv6 and
>>>>> IPv4 networks as shown in Figure 4(b).
>>>>>
>>>>> Nota: PLT es Page Load Time, que creo que es equivalente a lo
>>>>> que yo indicaba de “time to complete http get”.
>>>>>
>>>>> Hay otras partes del documento que por ejemplo indican mejoras
>>>>> en T-Mobile (red "pura” IPv6-only) del RTT entre el 49 y el
>>>>> 64%.
>>>>>
>>>>> El documento tiene muchas otras referencias, quizás algunas
>>>>> sean de mediciones similares.
>>>>>
>>>>> Saludos,
>>>>> Jordi
>>>>>
>>>>> @jordipalet
>>>>>
>>>>>
>>>>>> El 21 nov 2025, a las 22:53, Henri Alves de Godoy vía LACNOG
>>>>>> <lacnog en lacnic.net <mailto:lacnog en lacnic.net>> escribió:
>>>>>>
>>>>>> Hola Fernando y Jordi,
>>>>>>
>>>>>> En LACNIC 34 , realizei um teste simples, realizando as
>>>>>> traduções via 464XLAT utilizando o Jool, apresentaram
>>>>>> pouquíssima variação de desempenho. Talvez isso ocorra porque
>>>>>> o mecanismo de transição opera diretamente no kernel Linux,
>>>>>> garantindo latências muito próximas entre IPv4 e IPv6, mesmo
>>>>>> sob carga.
>>>>>>
>>>>>> Por curiosidade, realizarei outros em breve para comparar os
>>>>>> cenários atualmente.
>>>>>>
>>>>>> Segue anexo.
>>>>>>
>>>>>> Abraços !
>>>>>> Henri.
>>>>>>
>>>>>> Em sex., 21 de nov. de 2025 às 17:09, Fernando Gont
>>>>>> <fgont en si6networks.com <mailto:fgont en si6networks.com>>
>>>>>> escreveu:
>>>>>>
>>>>>> Hola, Jordi,
>>>>>>
>>>>>> On 21/11/2025 15:52, jordi.palet--- vía LACNOG wrote:
>>>>>> > Hola Fernando,
>>>>>> >
>>>>>> > A mi FB nunca me dijo que tuviera dudas, y ademas
>>>>>> Akamai y otros
>>>>>> > hicieron las mismas mediciones y coincidían, y yo
>>>>>> también lo he
>>>>>> > comprobado en despliegues de clientes.
>>>>>>
>>>>>> Repito: Cuales son las referencias a las publicaciones?
>>>>>>
>>>>>>
>>>>>>
>>>>>> > Digo yo que tanta coincidencia,
>>>>>> > por algo será, además de la lógica de tener o no
>>>>>> multiples traducciones
>>>>>> > que sabemos que son latencia adicional.
>>>>>>
>>>>>> Estamos hablando en serio?
>>>>>>
>>>>>> Se supone que si uno va a tirar datos, se tiene que
>>>>>> entender, al menos
>>>>>> por arriba, las condiciones y limitaciones del
>>>>>> experimento, y en
>>>>>> principio un analisis (con sustancia) que permita
>>>>>> entender los
>>>>>> resultados obtenidos.
>>>>>>
>>>>>> Respecto de las traducciones, alguien cuantifico la
>>>>>> latencia, de forma
>>>>>> mas o menos seria?
>>>>>>
>>>>>> -- Fernando Gont
>>>>>> SI6 Networks
>>>>>> e-mail: fgont en si6networks.com
>>>>>> <mailto:fgont en si6networks.com>
>>>>>> PGP Fingerprint: F242 FF0E A804 AF81 EB10 2F07 7CA1 321D
>>>>>> 663B B494
>>>>>>
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>>>>>>
>>>>>> --
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>>>>>
>>>>>
>>>>> **********************************************
>>>>> IPv4 is over
>>>>> Are you ready for the new Internet ?
>>>>> http://www.theipv6company.com <http://www.theipv6company.com/>
>>>>> The IPv6 Company
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>>>>> --
>>>>
>>>>
>>>> **********************************************
>>>> IPv4 is over
>>>> Are you ready for the new Internet ?
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>>>> The IPv6 Company
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>
>
> **********************************************
> 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.
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--
Fernando Gont
SI6 Networks
e-mail: fgont en si6networks.com
PGP Fingerprint: F242 FF0E A804 AF81 EB10 2F07 7CA1 321D 663B B494
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