Configure Network ACL

Question

Hi,

I want to configure network ACL to allow client IP addresses alone in inbound rule for aws transfer family.

As of now am using security as a security group.

As my project requires security as Network ACL need to configure.

Below is my stack sample stack.

```
SecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupName: "Production Security Group"
      GroupDescription: "Security Group with inbound and outbound rule" 
      VpcId: !Ref VPC
      SecurityGroupIngress:
      - IpProtocol: tcp
        FromPort: 80
        ToPort: 80
        CidrIp: 0.0.0.0/0
      - IpProtocol: tcp
        FromPort: 22
        ToPort: 22
        CidrIp: 0.0.0.0/0
      - IpProtocol: udp
        FromPort: 69
        ToPort: 69
        CidrIp: 96.47.148.171/32
      - IpProtocol: tcp
        FromPort: 22
        ToPort: 22
        CidrIp: 3.16.146.0/29
      SecurityGroupEgress:
      - IpProtocol: tcp
        FromPort: 80
        ToPort: 80
        CidrIp: 0.0.0.0/0
      Tags:
        - Key: Name
          Value: !Sub ${EnvironmentName} SecurityGroup

EndpointDetails:
        VpcId: !Ref VPC
        SubnetIds: 
          - !Ref PublicSubnet
        AddressAllocationIds:
          - !GetAtt NatGatewayEIP.AllocationId
      Tags:
        - Key: Name
          Value: !Sub ${EnvironmentName} EndpointDetails
```

Accepted Answer

Hi Mehandra,

Here you need use two CloudFormation resources : AWS::EC2::NetworkAcl and AWS::EC2::NetworkAclEntry. 
First create NetworkAcl and in NetworkAclEntry you allow/deny specific IPs/CIDR.

You can find good example here : https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-networkaclentry.html#aws-resource-ec2-networkaclentry--examples

BUT before implementing it please note that NetworkACLs are associated with subnets so if you run any resource under that subnet then only IP which is allowed in NetworkACL will able to access resource. **If your goal is protect only specific resource I would still recommend Security Group because with NetworkACL you are restricting access for whole subnet.  **

Configure Network ACL

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