This is the new *CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [AWS CloudFormation User Guide](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html).
# AWS::EC2::NetworkInterfacePermission

Specifies a permission for the network interface, For example, you can grant an AWS-authorized account permission to attach the network interface to an instance in their account.
## Syntax

To declare this entity in your CloudFormation template, use the following syntax:
### JSON

```
{
 "Type" : "AWS::EC2::NetworkInterfacePermission",
 "Properties" : {
 "[AwsAccountId](#cfn-ec2-networkinterfacepermission-awsaccountid)" : {{String}},
 "[NetworkInterfaceId](#cfn-ec2-networkinterfacepermission-networkinterfaceid)" : {{String}},
 "[Permission](#cfn-ec2-networkinterfacepermission-permission)" : {{String}}
 }
}
```
### YAML

```
Type: AWS::EC2::NetworkInterfacePermission
Properties:
 [AwsAccountId](#cfn-ec2-networkinterfacepermission-awsaccountid): {{String}}
 [NetworkInterfaceId](#cfn-ec2-networkinterfacepermission-networkinterfaceid): {{String}}
 [Permission](#cfn-ec2-networkinterfacepermission-permission): {{String}}
```
## Properties

`AwsAccountId` 
The AWS account ID. 
*Required*: Yes 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`NetworkInterfaceId` 
The ID of the network interface. 
*Required*: Yes 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`Permission` 
The type of permission to grant: `INSTANCE-ATTACH` or `EIP-ASSOCIATE`. 
*Required*: Yes 
*Type*: String 
*Allowed values*: `INSTANCE-ATTACH | EIP-ASSOCIATE` 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
## Return values

### Ref

When you pass the logical ID of this resource to the intrinsic `Ref` function, `Ref` returns the resource name. For example: `eni-perm-055663b682ea24b48`.
For more information about using the `Ref` function, see [https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-ref.html](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-ref.html).
## Examples

### Grant INSTANCE-ATTACH permission

The following example creates a permission (`INSTANCE-ATTACH`) for a specified network interface and AWS account.
#### JSON

```
"MyNetworkInterfacePermission": {
 "Type": "AWS::EC2::NetworkInterfacePermission",
 "Properties": {
 "NetworkInterfaceId": "eni-030e3xxx",
 "AwsAccountId": "11111111111",
 "Permission": "INSTANCE-ATTACH"
 }
}
```
#### YAML

```
 MyNetworkInterfacePermission:
 Type: AWS::EC2::NetworkInterfacePermission
 Properties:
 NetworkInterfaceId: eni-030e3xxx
 AwsAccountId: '11111111111'
 Permission: INSTANCE-ATTACH
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