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Subnet Management

Subnet Management

Subnets are sub-networks created within your VPC. They are equivalent to a LAN in a physical system. You can attach one or more Subnets to a virtual machine depending on your needs.

Create a New Subnet​

To create a new Subnet, follow these steps:

Step 1: In the menu, select Networking > Subnets. Click Create subnet.

Step 2: Enter the required system information:

  • Name: Enter a memorable name for the Subnet.

  • Type: Currently supports 2 types:

    • Routed: The subnet will route to the Internet through a NAT gateway.

    • Isolated: The subnet will not route to the Internet.

  • Network Address (CIDR): Enter a valid CIDR.

  • Gateway IP: Enter a valid Gateway address.

  • Static IP Pool (optional): Enter the IP range you want to use. If left blank, the system will use all IPs from the CIDR.

  • Primary DNS: Enter a DNS address in IPv4 format. If left blank, the system will automatically set the default value to 8.8.8.8.

  • Secondary DNS (optional): Enter a Secondary DNS in IPv4 format. If left blank, the system will automatically set the default value to 8.8.8.8.

  • Add tag (optional): Select tags to attach to the subnet.

Step 3: Click Create subnet to create the new Subnet. The system will process and notify you of the result.

If successful, the newly created Subnet will be displayed in the Subnets table.

View Subnet Details​

Allows viewing some information about the Subnet:

  • Subnet name

  • CIDR

  • Gateway (only supported for VPC type Specific)

  • IP Used

  • IP List

    • Private IP

    • Device Name: IP information currently attached to an Instance or Load Balancer (only supported for VPC type Specific). If it is an Instance, the device name is the hostname of the Instance. If it is a Load Balancer, the device name is the Load Balancer name.

    • Attach device

    • System Status

    • Admin Status

Rename a Subnet​

Step 1: In the menu, select Subnets. In the Actions section of the subnet to rename, select Rename.

Step 2: The Rename subnet modal appears. Enter the new name and click Rename subnet to save the change.

Convert Subnet from Isolated to Routed​

Follow these steps:

Note: This feature is only supported on VPCs with a single Gateway. If your VPC has multiple Gateways, please contact the support team for assistance.

Step 1: In the menu, select Subnets, then select Actions > Edit to Routed.

Step 2: A dialog box appears. Confirm and click Change to routed to apply the change.

Step 3: After the change is successfully applied, the system updates the subnet list with the Type and Edge gateway information.

Change DNS Server Information​

Step 1: In the menu, select Subnets. For the subnet whose DNS server you want to change, select Actions > Edit DNS server.

Step 2: Enter the new DNS server information and click Edit DNS to update.

Manage Tags for a Subnet​

Step 1: In the menu, select Subnets. For the subnet to tag, select Actions > Manage tags.

Step 2: Select a tag from the list and click Save to update.

Create a Private IP (IP Port)​

This feature is only available to General users.

The IP Port feature allows creating private IP addresses. Users can designate and reserve IP addresses for various purposes.

Step 1: In the menu, select Subnet. The system will display the list of corresponding Subnets.

Step 2: Click on the details of a subnet. Click Create private IP.

Step 3: A dialog box appears. Enter the following information:

  • Subnet name: The system displays the user's subnet name by default and cannot be edited.

  • IP address: Enter a valid IP address that belongs to the subnet.

  • MAC address: Enter a MAC address (optional field).

Note: The IP address created will be in the enabled (Up) state.

Step 4: Click Create Private IP to create the IP address. The system will initialize and notify you of the result. The private IP address will be displayed on the Subnet detail page after creation.

Disable Admin State​

Step 1: In the menu, select Subnet, then click on a specific Subnet's details. Select a private IP address with Admin State set to Up > click Actions.

Step 2: Select Disable admin state. The system will disable the private IP address (Admin State changes from Up to Down) and update this status on the Subnet detail page.

Enable Admin State​

Note: If the user's private IP is being used for Allow address pair, the "Enable admin state" action cannot be performed.

Step 1: In the menu, select Subnet, then click on a specific Subnet's details. Select a private IP address with Admin State set to Down > click Actions.

Step 2: Select Enable admin state. The system will enable the private IP address (Admin State changes from Down to Up) and update the status on the Subnet detail page.

Delete a Private IP​

Delete a private IP address when it is no longer needed.

Step 1: In the menu, select Subnet, then click on a specific Subnet's details. Select a private IP address with Admin State set to Up > click Actions.

Step 2: Click Delete. A warning dialog box appears to confirm the action. Confirm by clicking Yes, delete it.

Note: If the private IP address is currently in use or the IP address is attached to an address pair, it cannot be deleted.

If you want to delete it, please remove the IP from the allow address pair first.

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Figure: 172.26.166.145 is currently attached to an allow address pair

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Warning modal: the delete action cannot be performed

Delete a Subnet from VPC​

Note: All virtual machines must be removed from the Subnet before performing this action.

If you no longer need a Subnet, you can delete it from the VPC. To delete a Subnet, follow these steps:

Step 1: In the menu, select Subnets. In the Actions section of the subnet to delete, select Delete.

Step 2: The system will display a confirmation popup. To confirm deletion, select Delete network.

Manage Load Balancer Subnets​

Note: This feature is only available for certain Tenants with special configurations. Please contact us for support.

  • Load Balancer subnets are named LB-data-net. These subnets are reserved for Load Balancers, cannot be used with other resources, and do not support management operations.

  • Access a Load Balancer subnet's details on the subnet management page to manage the list of IPs currently in use within the subnet.

Last updated on by Dang Tran