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According to Fast Technology on July 21, Alibaba Cloud recently issued an announcement, announcing that it will implement intelligent traffic control measures for resolution requests of the free version of the public DNS from 24:00 on September 30, 2024.

According to the announcement, the free version of Alibaba Cloud Public DNS will limit the number of concurrent request source IPs. Specifically, when the number of requests for a single IP exceeds 20QPS, or the UDP/TCP traffic exceeds 2000bps, the speed limit policy will be triggered.

Alibaba Cloud emphasized that the free version of the service is mainly suitable for low-concurrency use of personal terminals. In the case of excessive traffic, users may trigger the speed limit policy.

Moreover, the free version does not guarantee the availability of the service. Therefore, Alibaba Cloud recommends that enterprises and commercial scenarios use the paid version of the service to avoid resolution unavailability due to traffic control.

For users who have higher requirements for resolution services, Alibaba Cloud provides a paid version of the public DNS service. The paid version not only promises 99.99% resolution service availability, but also users will not be affected by speed limits.

The paid version provides 10 million free HTTP resolution traffic resource packages per month. After exceeding the free quota, it will be charged at 0.04 yuan/10,000 HTTP resolutions, or 0.04 yuan/2,000 HTTPS resolutions.

Of course, users can also switch to other public DNS services when necessary, such as Tencent Public DNS or ByteDance Volcano Engine Public DNS, Baidu Public DNS, etc.

The impact of this adjustment on individual users is relatively small, but for corporate users who rely on high-concurrency resolution services, they may need to reconsider their DNS service plans.