---
title: "Associating Elastic IP Addresses"
canonical: "https://docs.infoblox.com/space/BloxOneInfrastructure/204637593/Associating%20Elastic%20IP%20Addresses"
format: markdown
---
If you want to use multiple network interfaces, you will need to associate a pre-allocated Elastic IP address with the interface because you cannot auto-assign a public IP. Note that Elastic IP address is needed for the primary interface only, and is not required on each additional interface.

To associate an Elastic IP address with a network interface:

1. Open the Amazon EC2 console at [https://console.aws.amazon.com/ec2/](https://console.aws.amazon.com/ec2/).
2. In the navigation pane, choose **Elastic IPs**.
3. Select the Elastic IP address to associate and choose **Actions **> **Associate Elastic IP address**.
4. For **Resource type**, choose **Network interface**.
5. For **Network interface**, choose the network interface with which to associate the Elastic IP address. You can also enter text to search for a specific network interface.
6. Optionally, for **Private IP address**, specify a private IP address with which to associate the Elastic IP address.
7. Choose **Associate**.
8. To add multiple network interfaces to the on-prem instance, see **Step 3: Configure Instance Details** in [*Deploying NIOS-X Servers on AWS*](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneInfrastructure/pages/204801210).

For more information, refer to the AWS documentation.