Help Center/ Document Database Service/ User Guide (Ally Region)/ Getting Started with Replica Sets/ Connecting to a Replica Set Instance/ Connection Methods
Updated on 2026-01-12 GMT+08:00
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Connection Methods

You can access DDS over private or public networks.

Table 1 Connection methods

Method

IP Address

Scenario

Description

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, AZ, and VPC subnet as your DDS instance, you are advised to use a private IP address to connect the ECS to your DDS instance.

Secure and excellent performance

Public network

EIP
  • If your applications are running on an ECS that is in a different region from the one where your DDS instance is located, use an EIP to connect the ECS to your instance.
  • If your applications are deployed on another cloud platform, EIP is recommended.
  • Low security
  • 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.