Amazon EC2 Instance IP Addressing

To assign a secondary private IP address when launching an instance in EC2-VPC

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.

2. Click the Launch Instance button.

3. On the Create a New Instance page, click Classic Wizard, and then click Continue.

4. On the CHOOSE AN AMI page, the Quick Start tab displays a list of basic configurations called Amazon Machine Images (AMI). Choose an AMI and click its Select button.

5. On the INSTANCE DETAILS page, set the number and type of instance to launch. You can select a subnet or let us choose one. Confirm your selections, and then click Continue.

6. On the next INSTANCE DETAILS page, under Advanced Instance Options, do the following, and then click Continue:

   1. Select the number of network interfaces to attach to the instance. The console enables you specify up to 2 network interfaces when you launch an instance. After you launch the instance, click Network Interfaces in the navigation pane to add additional network interfaces. The total number of network interfaces that you can attach varies by instance type. For more information, see Private IP Addresses Per ENI Per Instance Type.

   2. For each network interface, you can specify a primary private IP address, and one or more secondary private IP addresses. For this example, however, accept the IP address that we automatically assign.

   3. Beside Secondary IP Addresses, click Add, and then enter a private IP address in the subnet range, or accept the default, auto-assign, to let us select an address.

      Important

      After you have added a secondary private IP address to a network interface, you must connect to the instance and configure the secondary private IP address on the instance itself. For more information, see Configuring the Operating System on Your Instance to Recognize the Secondary Private IP Address .

   

7. On the next INSTANCE DETAILS page, you can specify volumes to attach to the instance besides the volumes specified by the AMI (such as the root device volume), and then click Continue.

8. On the final INSTANCE DETAILS page, specify tags for the instance, such as a user-friendly name, and then click Continue.

9. On the CREATE KEY PAIR page, select an existing key pair or create a new one. If you create a new key pair, you must download it before you can click Continue.

   If you're new to Amazon EC2 and haven't created any key pairs, the wizard prompts you to create one.

10. On the CONFIGURE FIREWALL page, select an existing security group for the primary network interface, or create a new one, and then click Continue.

    The security group for the additional network interface was previously selected when the ENI was created.

11. On the REVIEW page, review the settings, and then click Launch to begin launching your instance.

To assign a secondary private IP to an existing instance

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.

2. In the navigation pane, do one of the following:

   • Click Instances, and then right-click the instance.

   • Click Network Interfaces, and then right-click the network interface attached to the instance.

3. Select Manage Private IP Addresses.

4. In the Manage Private IP Addresses dialog box, do the following:

   1. Click Assign a secondary private address.

   2. In the Address field, enter a specific IP address that's within the subnet range for the instance, or leave the field blank and we'll select an IP address for you.

   3. (Optional) Select Allow reassignment to allow the secondary private IP address to be reassigned if it is already assigned to another network interface.

   4. Click Yes, Update, and then click Close.

   

To assign an EIP to a secondary private IP address in EC2-VPC

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.

2. Click Elastic IPs in the navigation pane.

3. Right-click the IP address, and then click Associate.

4. In the Associate Address dialog box, select the network interface from the Network Interface drop-down list, and then select the secondary IP address from the Private IP address drop-down list.

5. Click Yes, Associate.

To view the private IP addresses assigned to a network interface in EC2-VPC

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.

2. Click Network Interface in the navigation pane.

3. Select the network interface whose private IP addresses you want to view.

4. On the Details tab in the details pane, check the Primary IP and Secondary Private IPs fields for the primary private IP address and any secondary private IP addresses assigned to the network interface.

To view the private IP addresses assigned to an instance

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.

2. Click Instances in the navigation pane.

3. Select the instance whose private IP addresses you want to view.

4. On the Description tab in the details pane, check the Primary IPs and Secondary Private IPs fields for the primary private IP address and any secondary private IP addresses assigned to the instance through its network interface.

To unassign a secondary private IP address from an instance

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.

2. Click Instances in the navigation pane.

3. Right-click an instance, and then click Manage Private IP Addresses.

4. In the Manage Private IP Addresses dialog box, beside the secondary private IP address to unassign, click Unassign.

5. Click Yes, Update, and then click Close.

   

To unassign a secondary private IP address from a network interface

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.

2. Click Network Interface in the navigation pane.

3. Right-click an instance, and the click Manage Private IP Addresses.

4. In the Manage Private IP Addresses dialog box, beside the secondary private IP address to unassign, click Unassign.

5. Click Yes, Update, and then click Close.