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 all 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 excellent 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 the DDS instance is located, use an EIP to connect the ECS to your DDS instances. If you use a third-party device or your local device to connect to a DDS instance, you can use an EIP to connect to the DB instance.	Low security