Starting from October 1st, Alibaba Cloud Public DNS will limit the rate of free resolution requests.

According to news from this site on July 19, Alibaba Cloud issued an announcement announcing that it will adopt intelligent traffic control measures for free resolution requests in public DNS starting from 24:00 on September 30, 2024. Public DNS will still be committed to providing high-quality basic recursive resolution services to free users. However, in high-concurrency resolution scenarios, the number of concurrent requests for public DNS free traffic will be limited based on the request source IP. The upper limit of concurrent requests is not a fixed threshold. The specific speed limit value will be adjusted in a timely manner based on network load conditions and the overall service quality of the public DNS to ensure the stability and user experience of the overall public DNS service. Note from this site: Alibaba Cloud DNS is the general name for the full range of domain name resolution service products provided by Alibaba Cloud. Unlike traditional DNS, which only covers a single environment, Alibaba Cloud DNS products cover public network domain name resolution, VPC intranet domain name resolution, mobile resolution, and private cloud domain name resolution scenarios. Public DNS is a global public recursive domain name resolution service for all Internet users. This speed limit only affects the free version of public DNS (including DoH, DoT and UDP, TCP access methods).

* Alibaba Cloud officially explained that the free version of the service is suitable for low-concurrency use on personal terminals. If the traffic is too high (i.e. DoH/DoT: single IP visits exceed 20QPS, UDP/TCP traffic exceeds 2000bps), the limit will be triggered. Speed ​​ strategy. Individual users can also access the paid version service. The paid version product provides 10 million free HTTP parsing traffic resource packages every month, which can basically meet personal usage scenarios.

The free version does not guarantee service availability and is not recommended for use in enterprise, commercial and other scenarios. In enterprise and commercial operation scenarios, it is recommended to formally access the paid version of the public DNS service to avoid resolution unavailability caused by traffic control.
• For affected users, Alibaba Cloud recommends upgrading to the public DNS paid version. The public DNS paid version promises 99.99% resolution service availability, and users of the paid version will not be subject to
• speed limits.

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