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[android-developers] Android Behavior En Dual Stack Consulta de DNS

To: Android Developers <android-developers@xxxxxxxxxxxxxxxx>
Subject: [android-developers] Android Behavior En Dual Stack Consulta de DNS
From: Vidyasagar K <vksagar82@xxxxxxxxx>
Date: Thu, 3 Aug 2017 00:09:19 -0700 (PDT)
Delivery-date: Thu, 03 Aug 2017 03:10:23 -0400
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Quiso saber lo que es el *behavior de *Android teléfono cuándo el *APN el modo es 
dual *stack(ambos *IPv4/*v6) y el cliente recibe ambos *Ipv4 y *V6 dirección.

*Razón: *

- hemos probado aplicaciones múltiples y descubierto que la aplicación 
espera para la respuesta de AAAA antes de disparar una Una consulta hacia el DNS 
*servers. [Tiene sujetado un *wireshark de uno del asunto de aplicación *i había 
afrontado]

*Cuestiones:*

- Si esto es el *default *behavior del OS, entonces puede alguien me señala fuera 
en lo que es el esperar tiempo de respuesta de AAAA antes de una Una consulta es disparada. (Junto con 
vínculo/ de fuente de la documentación si tienes cualquier)?

- Es allí en todo caso podemos cambiar el OS *behavior para disparar #ambos AAAA & Una Consulta 
simultáneamente y establecer una conexión de TCP con el modo (*IPv4/*V6) quién 
*responds con un 'Ningún Error' código de respuesta? - Esto podría solucionar muchos 
problemas en casos donde entradas de DNS han sido hechas pero la aplicación/de sitio 
no es *ready en *IPv6.

*Thanks & Consideraciones, 

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wanted to know what is the behavior of Android phone when the APN mode is 
dual stack(both IPv4/v6) and client receives both Ipv4 and V6 address.

*Reason: *

- We have tested multiple applications and found out that the application 
waits for the AAAA response before firing a A query towards the DNS 
servers. [have attached a wireshark of one of the application issue i had 
faced]

*Questions:*

- If this is the default behavior of the OS, then can someone point me out 
on what is the wait time of AAAA response before a A query is fired. (Along 
with documentation/ source link if you have any)?

- Is there anyway we can change the OS behavior to fire both AAAA & A Query 
simultaneously and establish a TCP connection with the mode (IPv4/V6) who 
responds with a 'No Error' response code? - This could solve a lot of 
problems in cases where DNS entries have been made but the site/application 
is not ready in IPv6.

Thanks & Regards, 

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