Skip to main content

Guide: Associate and Disassociate a Floating IP

After allocating a Floating IP, you need to associate it with a port (NIC) of an Instance so that Instance can receive traffic from the internet through the public IP address. When it is no longer needed, you can disassociate or fully release the IP address.

Associate a Floating IP with an Instance​

Before you begin​

  • The target Instance must be running and have at least one port (NIC) in the same VPC.
  • The Floating IP must be in Down status (not yet assigned to any other Instance).

Steps​

  1. Navigate to the Floating IP page:

    • Select VPC → Network → Floating IP.

  2. In the list, find the IP address you want to associate. Click the Actions menu (three-dot icon ⋮) at the end of the corresponding row.

  3. Select Associate from the action list.

  4. The Associate Floating IP dialog opens. Do the following:

    • Select the target Instance from the dropdown list.
    • Select the Port (NIC) of the Instance — each port corresponds to a specific Private IP address.

  5. Click Confirm to proceed.

  6. The system links the Floating IP to the selected port. The IP status column changes to Active and the Private IP column displays the corresponding internal address.

Note: After a successful association, the Instance can receive connections from the internet via the Floating IP address. However, traffic must still be permitted by the Security Group attached to the Instance. If you cannot ping the IP after associating, check the Security Group rules — see Troubleshooting.

Disassociate a Floating IP from an Instance​

Disassociating detaches the Floating IP from an Instance but does not delete the IP address. The IP returns to Down status and can be associated with another Instance at any time.

Steps​

  1. On the Floating IP row you want to disassociate, click the Actions menu (⋮).

  2. Select Disassociate.

  3. Confirm the action in the confirmation dialog.

  4. The IP status returns to Down; the Port and Private IP columns become empty.

Release a Floating IP​

Releasing permanently removes the Floating IP from the VPC and returns the address to the system pool. After this operation, the IP address cannot be recovered.

Prerequisite​

The Floating IP must be in Down status (disassociated from all Instances) before it can be released. If the IP is in Active status, perform Disassociate first.

Steps​

  1. On the Floating IP row you want to release, click the Actions menu (⋮).

  2. Select Release.

  3. Read the warning in the confirmation dialog carefully — this action cannot be undone.

  4. Click Confirm to release. The IP row disappears from the list.

Operation flow summary​

Allocate IP  →  [IP status: Down]
     ↓
Associate    →  [IP status: Active, Private IP populated]
     ↓
Disassociate →  [IP status: Down]
     ↓
Release      →  (IP removed from VPC)