Express Connect circuits are used in Express Connect to connect on-premises databases to the cloud. You must configure a whitelist for the on-premises databases. If you want to connect on-premises databases to cloud services, you must add the CIDR blocks of the cloud services to the whitelists of the databases. The examples of the cloud services include Data Management (DMS), Data Transmission Service (DTS), and Database Backup Service (DBS). If the CIDR blocks change, you must update the configurations of the database whitelists. This results in high operations and maintenance (O&M) costs.
- The Alibaba Cloud Database Gateway service is activated. For more information, see Preparations.
- The Express Connect, VPN Gateway, or Cloud Enterprise Network (CEN) service is configured as required.
- When you create a database gateway, select Using Express/CEN/VPN Gateway to access. For more information about how to create a database gateway, see Create a database gateway.
- Specify the IP address of the host and the port number for the on-premises database. Then, click Complete.