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# AWS::EC2::VPNConnection Phase1DHGroupNumbersRequestListValue

Specifies a Diffie-Hellman group number for the VPN tunnel for phase 1 IKE negotiations.
## Syntax

To declare this entity in your CloudFormation template, use the following syntax:
### JSON

```
{
 "[Value](#cfn-ec2-vpnconnection-phase1dhgroupnumbersrequestlistvalue-value)" : {{Integer}}
}
```
### YAML

```
 [Value](#cfn-ec2-vpnconnection-phase1dhgroupnumbersrequestlistvalue-value): {{Integer}}
```
## Properties

`Value` 
The Diffie-Hellmann group number. 
*Required*: No 
*Type*: Integer 
*Allowed values*: `2 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24` 
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