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 scenarios in which unexpected high bills can occur, the risks, and the solutions to them.

Scenarios

Dynamic Route for CDN (DCDN) is a service that accelerates content delivery and provides only basic protection capabilities, which ensures the stability of DCDN points of presence (POPs). 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.

Potential risks: high bills caused by attacks or attack-like activities

  • If an attack occurs, you are charged for the bandwidth resources of DCDN and data transfer.
  • If your domain name is abused for data transmission, high bandwidth values or traffic spikes may occur. This is similar to an attack, and you are charged for bandwidth resources and data transfer.
  • If your 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 Introduction to sandboxes.

Potential consequences: bills that are higher than expected

If your domain name is under attack or abused for data transmission, the bills may be higher than expected and your account balance may be exhausted.

DCDN uses the pay-as-you-go billing method. In some cases, DCDN may not be suspended when the account balance reaches 0 due to different billing cycles (by hour, by day, or by month) or bill delays. Overdue payments may occur, including those whose amount due is higher than the value specified in the grace period policy.

DCDN supports grace periods. If you have a grace period configured, DCDN is not suspended before the grace period ends. The grace period is determined based on your account credibility and purchase history. The grace period is reset every month.

Solutions

To ensure that your DCDN service runs as expected and prevent unexpected high bills, we recommend that you enable protection features to manage network traffic. For more information, see the product page of Anti-DDoS. The following table lists the features that can be used to manage network traffic.
Feature Implementation method
Real-time monitoring If you want to monitor the peak bandwidth values of a domain name in real time, you can use CloudMonitor. CloudMonitor monitors the bandwidth values for specified domain names. After a bandwidth value reaches the specified threshold, notifications are sent to you by text messages, emails, or DingTalk messages. This alerts you of potential risks. For more information, see the product page of Cloud Monitor.
Spending management and alerts You can use the following features to monitor and limit the expenses of your DCDN service. To configure these features, move your pointer over Expenses in the top navigation bar of the console and select User Center.
  • Low capacity alerts: After this feature is enabled, DCDN sends you an alert when the balance of your account is lower than the alert threshold that you set.
  • Grace period: After this feature is disabled, DCDN stops running immediately after an overdue payment occurs. This prevents high overdue payments.
  • High bill alerts: After this feature is enabled, DCDN sends you an alert when a daily bill exceeds the alert threshold that you set by text messages.
Note To ensure the integrity of the statistics and the accuracy of the bills, DCDN issues the bill about three hours after a billing cycle ends. Therefore, the time when the relevant fees are deducted from your account balance may be later than the time when the resources are consumed within the billing cycle. Alibaba Cloud does not provide consumption details of DCDN resources in bills because DCDN is a distributed service. Other DCDN providers adopt similar approaches.