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AWS Network Access Control Lists (NACLs): Overview and Configuration Example

AWS Network Access Control Lists (NACLs) act as a firewall for controlling traffic in and out of subnets in Amazon Virtual Private Cloud (Amazon VPC). NACLs operate at the subnet level and are stateless, allowing you to define rules to control both inbound and outbound traffic. Here's a detailed overview of AWS NACLs along with a configuration example:

Features of AWS NACLs:

  1. Subnet-Level Control:

  2. Stateless Filtering:

  3. Rule Evaluation Order:

  4. Allow and Deny Rules:

  5. Default Deny:

  6. Numbered Rules:

Configuration Example:

Let's create a simple AWS Network ACL and define inbound and outbound rules for a subnet using the AWS Management Console:

  1. Login to AWS Console:

  2. Open VPC Console:

  3. Create Network ACL:

  4. Define Inbound Rules:

  5. Define Outbound Rules:

  6. Associate NACL with Subnet:

  7. Test Connectivity:

  8. Update NACL Rules (Optional):

  9. Monitor NACL Activity:

  10. Delete NACL (Optional):