# ModifyIpamPolicyAllocationRules
<a name="API_ModifyIpamPolicyAllocationRules"></a>

Modifies the allocation rules in an IPAM policy.

An IPAM policy is a set of rules that define how public IPv4 addresses from IPAM pools are allocated to Amazon resources. Each rule maps an Amazon service to IPAM pools that the service will use to get IP addresses. A single policy can have multiple rules and be applied to multiple Amazon Regions. If the IPAM pool run out of addresses then the services fallback to Amazon-provided IP addresses. A policy can be applied to an individual Amazon account or an entity within Amazon Organizations.

Allocation rules are optional configurations within an IPAM policy that map Amazon resource types to specific IPAM pools. If no rules are defined, the resource types default to using Amazon-provided IP addresses.

## Request Parameters
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The following parameters are for this specific action. For more information about required and optional parameters that are common to all actions, see [Common Query Parameters](CommonParameters.md).

 **AllocationRule.N**   
The new allocation rules to apply to the IPAM policy.  
Allocation rules are optional configurations within an IPAM policy that map Amazon resource types to specific IPAM pools. If no rules are defined, the resource types default to using Amazon-provided IP addresses.  
Type: Array of [IpamPolicyAllocationRuleRequest](API_IpamPolicyAllocationRuleRequest.md) objects  
Required: No

 **DryRun**   
A check for whether you have the required permissions for the action without actually making the request and provides an error response. If you have the required permissions, the error response is `DryRunOperation`. Otherwise, it is `UnauthorizedOperation`.  
Type: Boolean  
Required: No

 **IpamPolicyId**   
The ID of the IPAM policy whose allocation rules you want to modify.  
Type: String  
Required: Yes

 **Locale**   
The locale for which to modify the allocation rules.  
Type: String  
Required: Yes

 **ResourceType**   
The resource type for which to modify the allocation rules.  
The Amazon service or resource type that can use IP addresses through IPAM policies. Supported services and resource types include:  
+ Elastic IP addresses
Type: String  
Valid Values: `alb | eip | rds | rnat`   
Required: Yes

## Response Elements
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The following elements are returned by the service.

 **ipamPolicyDocument**   
The modified IPAM policy containing the updated allocation rules.  
Type: [IpamPolicyDocument](API_IpamPolicyDocument.md) object

 **requestId**   
The ID of the request.  
Type: String

## Errors
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For information about the errors that are common to all actions, see [Common client error codes](errors-overview.md#CommonErrors).

## 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 Command Line Interface V2](https://docs.amazonaws.cn/goto/cli2/ec2-2016-11-15/ModifyIpamPolicyAllocationRules) 
+  [Amazon SDK for .NET V4](https://docs.amazonaws.cn/goto/DotNetSDKV4/ec2-2016-11-15/ModifyIpamPolicyAllocationRules) 
+  [Amazon SDK for C\$1\$1](https://docs.amazonaws.cn/goto/SdkForCpp/ec2-2016-11-15/ModifyIpamPolicyAllocationRules) 
+  [Amazon SDK for Go v2](https://docs.amazonaws.cn/goto/SdkForGoV2/ec2-2016-11-15/ModifyIpamPolicyAllocationRules) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/ec2-2016-11-15/ModifyIpamPolicyAllocationRules) 
+  [Amazon SDK for JavaScript V3](https://docs.amazonaws.cn/goto/SdkForJavaScriptV3/ec2-2016-11-15/ModifyIpamPolicyAllocationRules) 
+  [Amazon SDK for Kotlin](https://docs.amazonaws.cn/goto/SdkForKotlin/ec2-2016-11-15/ModifyIpamPolicyAllocationRules) 
+  [Amazon SDK for PHP V3](https://docs.amazonaws.cn/goto/SdkForPHPV3/ec2-2016-11-15/ModifyIpamPolicyAllocationRules) 
+  [Amazon SDK for Python](https://docs.amazonaws.cn/goto/boto3/ec2-2016-11-15/ModifyIpamPolicyAllocationRules) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/ec2-2016-11-15/ModifyIpamPolicyAllocationRules)