How Do I Change the CIDR Block of an ECS Subnet?

Scenarios

You want to change the CIDR block of an ECS subnet. After you create a subnet, you cannot directly change its CIDR block.

To change a CIDR block, you need to change the subnet.

Prerequisites

The ECS has been stopped.

Procedure

1. Log in to the management console.
2. Under Compute, click Elastic Cloud Server.
3. In the search box above the ECS list, enter the ECS name, IP address, or ID, and click for search.
4. Click the name of the ECS whose subnet needs to be modified.

   The ECS details page is displayed.

5. Click the Network Interfaces tab. Locate the row containing the target network interface and click Modify Private IP.

   The Modify Private IP dialog box is displayed.

6. Change the subnet and private IP address of the primary NIC as required.
   

   • You can only change to a subnet within the same VPC.
   • If you do not specify the target private IP address, the system will automatically assign one to the primary NIC.

   For example, the original subnet is subnet-demo (192.168.0.0/24) and the new subnet is subnet-fe21 (192.168.6.0/25). Therefore, you change the ECS subnet CIDR block by changing the ECS subnet.