Because of this problem, the company's vice president, technical director, technical directors called me in the past accountability [IPv6]

This estimate is the most important practitioners since the accident.

Source of the problem:
the background a large area of user feedback can not enter the App.

Specific Positioning:
ios users are all normal, Android users probably can not enter 1/3 App. Interface set timeout duration is 30 seconds, is timed out each interface. Because only Android have this problem, it is thought to be due to end with the Android code and related environment.

Later confirmed in detail, only telecommunications 4g users have this problem (a problem with this determination, the other forgotten), then guess is over https certified question, what other questions not. Probably not a solution, to find a deputy chief engineer Ali, there is the initial positioning of IPv6 problems, according to this investigation finally found the problem!

Problem Cause:
telecommunications 4g automatically turn on IPv6, the other is IPv4. A few days ago because of the ios line, in order to examine the US side will be faster technical directors opened a service for IPv6, reply to us is not closed will lead our interface have been IPv6 service, but the service station frame abroad on the server, so the equivalent of 4g of telecommunications users will after a trip overseas server, generally can not get the data.

Then, after the technical directors like IPv6 turn off the service! I just escaped.

Unicom network	Telecommunications network
Unicom .jpg	telecommunications

IPv6 science

Brief introduction

IPv6 is the English "Internet Protocol Version 6" (Internet Protocol version 6) abbreviation, is the Internet Engineering Task Force (IETF) designed to replace IPv4 next-generation IP protocol, the number of addresses can be known around the world for each of grains of sand on an address coding.

And the difference between IPv4

The difference between ipv4 and ipv6 .jpg

In fact, the biggest difference between IPv6 and IPv4 is the number of different IP addresses.

我们现在用的是IPv4，你的外网地址可能是这样一串数字：59.123.123.123。IPv4的地址是32位，总数有43亿个左右，还要减去内网专用的192、170地址段，就更少了。而IPv6的地址是128位的，大概是43亿的4次方，地址极为丰富，几乎是取之不尽的。

好处

1.可以有更多的设备联网，连路灯都可以有独立IP。

IPv6具有更大的地址空间。IPv4中规定IP地址长度为32，最大地址个数为2^{32；而IPv6中IP地址的长度为128，即最大地址个数为2}128。与32位地址空间相比，其地址空间增加了2^128-232个。
“IPv6可以让每一粒沙子都上网”，全球有上百亿个设备，却只有40多亿个地址。而由于中国互联网起步晚，只分到了2.9亿个IP，所以是共用的。平常上上网倒没什么，但想从公网访问某一台上网设备，比如查看家里的摄像头，或者远程控制自己的电脑，就变得非常困难。换成IPv6之后，每台设备都可以有独立的IP地址。如果配合5G网络，每台汽车、路灯、垃圾桶、消防栓都可以有独立的IP地址。IPv6丰富的地址，让“物联网”成为可能。

2.更安全，响应更快

在使用IPv6网络中用户可以对网络层的数据进行加密并对IP报文进行校验，在IPV6中的加密与鉴别选项提供了分组的保密性与完整性。极大的增强了网络的安全性。
技术大牛都知道路由传输是根据路由条目进行数据转发，IPv6减少路由数量，更快转发传输数据，日常的上传下载速度更快；另外一方面IPv6网络在光纤高速传输技术方面，正沿着扩大单一波长传输容量、超长距离传输和密集波分复用系统三个方向在发展，通过波分复用直接提高网络吞吐量，网站打开延迟更小，速度更快。

网友评论

言下之意现在通过IP地址能定位到小区，IPv6就可以定位到你床上了。
有一天我被警察抓了，他会告诉我是我家洗衣机报的警，说我用力按它的按钮，属于家庭暴力。
信不信，以后IP要绑定身份证。
Finished finished, after Japan but also pleasant to look at it romance?

Deployment progress

To December 2018, Ali cloud 100% of the core product has completed the IPv6 transformation.

Alipay .jpg

Alibaba side said that the next 1-2 years, Ali ecological comprehensive support IPv6. Among them, the former in 2019 Q1, public outreach is completed, the main electricity supplier is the business of foreign service support for IPv6; by the end of 2019, IPv6 exchanges within the network is completed; and finally in 2020-2022 years, the full implementation only supports IPv6 (IPv6 Only ).

Reference material

Reproduced in: https: //www.jianshu.com/p/60c9a9a8e4d3