If your domain name is under attack or abused for data transmission, high bandwidth values or traffic spikes may occur. In this case, you may receive bills that are higher than expected. This topic describes the causes of unexpected high bills and the solutions to them.
Dynamic Route for CDN (DCDN) is a service that accelerates content delivery and provides only basic protection capabilities, which ensures the stability of DCDN nodes. If no extra security measures are implemented, DCDN cannot identify all attacks or ensure service stability in the case of website attacks.
High bills can be generated in the following scenarios:
- Scenario 1: Your domain name is under attack
If your domain name is attacked, you are charged for the bandwidth resources that are consumed to protect the domain name against the attacks.
- Scenario 2: Your website is abused for data transmission
If your website is abused for data transmission, the bandwidth usage may spike. This scenario is similar to Scenario 1. You are charged for the bandwidth resources that are consumed.
If a DCDN-accelerated domain name is under attack, the domain name is scheduled to a sandbox. In this case, DCDN does not guarantee service stability for the accelerated domain name. For more information, see Sandbox description.
|Bandwidth throttling||If you want to throttle bandwidth for DCDN, you can submit a ticket. Alibaba Cloud will configure bandwidth throttling for DCDN as required in the ticket.
Notice After a bandwidth value reaches the specified bandwidth cap, the data transfer rate is reduced and packet loss may occur.
|Real-time monitoring||If you want to monitor the peak bandwidth values of a domain name in real time, you can use Cloud Monitor. Cloud Monitor monitors the bandwidth values for specified domain names. After a bandwidth value reaches the specified threshold, notifications are sent to you through SMS messages, emails, or DingTalk messages. This alerts you of potential risks. For more information, see the product page of Cloud Monitor.|