One of the issues in China is the existence of the Great Firewall. Its impact is not only about blocking access, but also throttling non-mainland traffic during peak hours, such as in the evenings, through QoS restrictions.

Additionally, similar to most Asian home ISPs, Chinese ISPs are not inclined to optimize international routing. Usually, all non-mainland traffic is routed through the United States or European countries instead of connecting directly. Even for traffic to Hong Kong, if there is no paid peering agreement, the traffic from China Telecom's home broadband users will be routed through the United States before reaching Hong Kong.

Basically means you have to pay the 3 largest ISPs in China to have a better performance for users in China Mainland.
Brandon Zhi
HUIZE LTD

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On Wed, 22 May 2024 at 10:40, Mirai Azayaka <azayaka@apernet.io> wrote:
Hey, what kind of issue are you looking at? The three major ISPs are
China Telecom, China Unicom, and China Mobile. However, most issues
are probably related to the Great Firewall (GFW). It can do many
different things (DNS poisoning, IP blackhole, IP:port block, TCP
reset, etc.) on the state level.

On Wed, May 22, 2024 at 10:24 AM Vinod Ola <kumarvinodola@gmail.com> wrote:
>
> Yes but it has very old posts. Doesn’t look active anymore.
>
> We are having outlook disconnections since 2 weeks and Chinese ISP doesn’t tell what’s going on.
>
> Sent from my iPhone
>
> > On 22 May 2024, at 9:19 PM, Stephane Bortzmeyer <bortzmeyer@nic.fr> wrote:
> >
> > On Wed, May 22, 2024 at 08:18:05PM +0530,
> > Vinod Ola <kumarvinodola@gmail.com> wrote
> > a message of 139 lines which said:
> >
> >> Can anyone please help me to get view of China ISP issues and backbone issues?
> >
> > There is a chinese network operators group (found from
> > <https://labs.ripe.net/nogs/>)
> > but it seems without any real activity:
> >
> > https://groups.google.com/g/cnnog