Overview

An RDS DB instance can be connected through a private network, Data Admin Service (DAS), or a public network.

**Table 1** RDS connection methods
Connect Through	IP Address	Scenarios	Description
DAS	No IP address required	DAS enables you to manage databases on a web-based console and provides you with database development, O&M, and intelligent diagnosis to make it easy to use and maintain your databases. The permissions required for connecting to DB instances through DAS are enabled by default.	Easy to use, secure, advanced, and intelligent Recommended
Private network	Floating IP	A floating IP address is provided by default. If your applications are deployed on an ECS that is in the same region and VPC as your DB instance, you are advised to use a floating IP address to connect to the DB instance through the ECS.	Secure and high-performance Recommended
Public network	EIP	If you cannot access a DB instance through a floating IP address, bind an EIP to the DB instance and connect the DB instance through the EIP.	Less secure compared with other connection methods To achieve a higher transmission rate and security level, you are advised to migrate your applications to an ECS that is in the same VPC as your RDS DB instance and use a floating IP address to access the DB instance. You need to purchase an EIP. For details, see EIP billing details.