> **Experimental**
>
> `@aws-cdk/aws-ec2-alpha` is an [**experimental**](/stability) (alpha) package: its API may change in any release, without a major version bump.
# ITransitGatewayVpcAttachmentOptions

Options for Transit Gateway VPC Attachment.

- Stability: [Experimental](/cdk/api/stability.html)
- Source: [`lib/transit-gateway-vpc-attachment.ts`](https://github.com/aws/aws-cdk/blob/v2.274.0-alpha.0/packages/@aws-cdk/aws-ec2-alpha/lib/transit-gateway-vpc-attachment.ts#L18)

## Properties

- `applianceModeSupport`: boolean = disable (false) — Enable or disable appliance mode support.

- `dnsSupport`: boolean = disable (false) — Enable or disable DNS support.

- `ipv6Support`: boolean = disable (false) — Enable or disable IPv6 support.

- `securityGroupReferencingSupport`: boolean = disable (false) — Enables you to reference a security group across VPCs attached to a transit gateway.