# TransitGatewayNatRuleRequest
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Describes a NAT gateway rule to apply to a transit gateway attachment. A NAT gateway rule translates source addresses in the `MatchSourceCidr` range to the corresponding addresses in the `NatCidr` range.

## Contents
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 ** MatchSourceCidr **   
The IPv4 CIDR block of the source addresses to translate. The CIDR block can't overlap the multicast range (`224.0.0.0/4`) or the link-local range (`169.254.0.0/16`).  
Type: String  
Required: No

 ** NatCidr **   
The IPv4 CIDR block to translate the source addresses to. The CIDR block must be in a private (RFC 1918) or shared address space (RFC 6598) range, and must have the same prefix length as `MatchSourceCidr`. The CIDR blocks in the rules for an attachment can't overlap each other.  
Type: String  
Required: No

 ** RuleNumber **   
The rule number. Valid values are 1 to 32766. Each rule number must be unique within the request.  
Type: Integer  
Required: No

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