# ModifyTransitGatewayVpcAttachmentRequestOptions
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Describes the options for a VPC attachment.

## Contents
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 ** ApplianceModeSupport **   
Enable or disable support for appliance mode. If enabled, a traffic flow between a source and destination uses the same Availability Zone for the VPC attachment for the lifetime of that flow. The default is `disable`.  
Type: String  
Valid Values: `enable | disable`   
Required: No

 ** DnsSupport **   
Enable or disable DNS support. The default is `enable`.  
Type: String  
Valid Values: `enable | disable`   
Required: No

 ** Ipv6Support **   
Enable or disable IPv6 support. The default is `enable`.  
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 disabled 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/ModifyTransitGatewayVpcAttachmentRequestOptions) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/ec2-2016-11-15/ModifyTransitGatewayVpcAttachmentRequestOptions) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/ec2-2016-11-15/ModifyTransitGatewayVpcAttachmentRequestOptions)