Internet bandwidth types
The following table lists Internet bandwidth types and related information for ECS instances.
|Internet bandwidth types||Definition||Bandwidth limit|
|Outbound bandwidth||The bandwidth for outbound traffic from ECS instances, for example, when your ECS instances provide external access or you want to download internal resources from the ECS instances by using an FTP client.||
|Inbound bandwidth||The bandwidth for inbound traffic to ECS instances, for example, when you want to download resources from the Internet to your ECS instances, or upload resources to the ECS instances by using an FTP client.||Up to 200 Mbit/s|
Alibaba Cloud only charges fees for outbound traffic usage. The fee is calculated on an hourly basis and the billing unit is USD/GiB. When creating an instance, you can set a peak value for the outbound bandwidth to avoid incurring excessive fees due to traffic bursts.
Purchase Internet bandwidth
Different methods apply when you are purchasing Internet bandwidth for different Internet access modes:
If an ECS instance needs to access the Internet by using its own Internet address, you must purchase Internet bandwidth while creating the instance.
How to purchase: When creating an ECS instance, in the Network Billing Method part, select Assign public IP and set a peak value.
If your ECS instance is in a VPC network and you want to use an Elastic IP address (EIP) to access the Internet, you only need to purchase the EIP service. For more information about the EIP service, see EIP address related documentation.Note If your ECS instances access the Internet by using an EIP address, you must not select Assign public IP when you create an instance.
You can pay for Internet bandwidth by using any of the following payment options:
- Credit card or a PayPal account attached to your account.
- A data transfer plan. You can purchase a plan and deduct the traffic usage from it. For more information about data transfer plans, see ECS Starter Package Plan.
Bill calculation example
Assume that the average bandwidth of your ECS instance in an hour is 0.5 Mbit/s and the bandwidth price is USD 0.081 per GiB. You must pay the following amount for the hourly traffic:
[(0.5 × 60 × 60) /1024/8] GiB × 0.081 USD/GiB = 0.018 USD