AWS SDK Version 3 for .NET
API Reference

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Associates an Elastic IP address with an instance or a network interface.

An Elastic IP address is for use in either the EC2-Classic platform or in a VPC. For more information, see Elastic IP Addresses in the Amazon Elastic Compute Cloud User Guide.

[EC2-Classic, VPC in an EC2-VPC-only account] If the Elastic IP address is already associated with a different instance, it is disassociated from that instance and associated with the specified instance. If you associate an Elastic IP address with an instance that has an existing Elastic IP address, the existing address is disassociated from the instance, but remains allocated to your account.

[VPC in an EC2-Classic account] If you don't specify a private IP address, the Elastic IP address is associated with the primary IP address. If the Elastic IP address is already associated with a different instance or a network interface, you get an error unless you allow reassociation. You cannot associate an Elastic IP address with an instance or network interface that has an existing Elastic IP address.

This is an idempotent operation. If you perform the operation more than once, Amazon EC2 doesn't return an error, and you may be charged for each time the Elastic IP address is remapped to the same instance. For more information, see the Elastic IP Addresses section of Amazon EC2 Pricing.

Note:

For PCL this operation is only available in asynchronous form. Please refer to AssociateAddressAsync.

Namespace: Amazon.EC2
Assembly: AWSSDK.EC2.dll
Version: 3.x.y.z

Syntax

C#
public virtual AssociateAddressResponse AssociateAddress(
         AssociateAddressRequest request
)
Parameters
request
Type: Amazon.EC2.Model.AssociateAddressRequest

Container for the necessary parameters to execute the AssociateAddress service method.

Return Value
The response from the AssociateAddress service method, as returned by EC2.

Examples

This example associates the specified Elastic IP address with the specified instance in a VPC.

To associate an Elastic IP address in EC2-VPC


var response = client.AssociateAddress(new AssociateAddressRequest 
{
    AllocationId = "eipalloc-64d5890a",
    InstanceId = "i-0b263919b6498b123"
});

string associationId = response.AssociationId;

            

This example associates the specified Elastic IP address with the specified network interface.

To associate an Elastic IP address with a network interface


var response = client.AssociateAddress(new AssociateAddressRequest 
{
    AllocationId = "eipalloc-64d5890a",
    NetworkInterfaceId = "eni-1a2b3c4d"
});

string associationId = response.AssociationId;

            

This example associates an Elastic IP address with an instance in EC2-Classic.

To associate an Elastic IP address in EC2-Classic


var response = client.AssociateAddress(new AssociateAddressRequest 
{
    InstanceId = "i-07ffe74c7330ebf53",
    PublicIp = "198.51.100.0"
});


            

Version Information

.NET Framework:
Supported in: 4.5, 4.0, 3.5

Portable Class Library:
Supported in: Windows Store Apps
Supported in: Windows Phone 8.1
Supported in: Xamarin Android
Supported in: Xamarin iOS (Unified)
Supported in: Xamarin.Forms

See Also