# TransitGatewayVpcAttachmentOptions
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Describes the VPC attachment options.

## Contents
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 ** applianceModeSupport **   
Indicates whether appliance mode support is enabled.  
Type: String  
Valid Values: `enable | disable`   
Required: No

 ** dnsSupport **   
Indicates whether DNS support is enabled.  
Type: String  
Valid Values: `enable | disable`   
Required: No

 ** ipv6Support **   
Indicates whether IPv6 support is disabled.  
Type: String  
Valid Values: `enable | disable`   
Required: No

 ** securityGroupReferencingSupport **   
Enables you to reference a security group across VPCs attached to a transit gateway to simplify security group management.  
This option is enabled by default.  
For more information about security group referencing, see [Security group referencing](https://docs.aws.amazon.com/vpc/latest/tgw/tgw-vpc-attachments.html#vpc-attachment-security) in the * AWS Transit Gateways Guide*.  
Type: String  
Valid Values: `enable | disable`   
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/ec2-2016-11-15/TransitGatewayVpcAttachmentOptions) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/ec2-2016-11-15/TransitGatewayVpcAttachmentOptions) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/ec2-2016-11-15/TransitGatewayVpcAttachmentOptions)