Connection Methods

You can access DDS over private or public networks.

**Table 1** Connection methods
Method	IP Address	Scenario	Description
DAS	Not required	DAS provides a GUI and allows you to perform visualized operations on the console. SQL execution, advanced database management, and intelligent O&M are available to make database management simple, secure, and intelligent. By default, the permission to connect to DAS is enabled.	Easy to use, secure, advanced, and intelligent Recommended
Private network	Private IP address	DDS provides a private IP address by default. If your applications are running on an ECS in the same region and VPC as your DDS instance, you are advised to use a private IP address to connect the ECS to your DDS instances.	Secure and high-performance For faster transmission and improved security, you are advised to migrate your applications to an ECS that is in the same subnet as your DDS instance and use a private IP address to access the instance.
Public network	EIP	If your applications are running on an ECS that is in a different region from the one where your DB instance is located, use the EIP of a public gateway to connect the ECS to your DB instance. If you use a third-party device or your local device to connect to a DDS instance, use the EIP of a public gateway to connect to the DB instance.	Less secure For faster transmission and improved security, you are advised to migrate your applications to an ECS that is in the same subnet as your DDS instance and use a private IP address to access the instance. You need to purchase an EIP to connect to a DB instance over a public network. For details, see EIP Pricing Details. You need to purchase a public NAT gateway to connect to a DB instance over a public network. For details, see NAT Gateway Pricing Details.