The differences between NACL and security groups have been discussed below:
| NACL | Security Group |
|---|---|
| Network Access Control List that helps provide a layer of security to the amazon web services. There are two kinds of NACL- Customized and default. | A security group has to be explicitly assigned to an instance; it doesn’t associate itself to a subnet. |
| Multiple subnets can be bound with a single NACL, but one subnet can be bound with a single NACL only, at a time | Security groups are associated with an instance of a service. It can be associated with one or more security groups which has been created by the user. |
| NACL can be understood as the firewall or protection for the subnet. | Security group can be understood as a firewall to protect EC2 instances. |
| These are stateless, meaning any change applied to an incoming rule isn’t automatically applied to an outgoing rule. | These are stateful, which means any changes which are applied to an incoming rule is automatically applied to a rule which is outgoing. |
| Example: If a request comes through port 80, it should be explicitly indicated that its outgoing response would be the same port 80. | Example: If the incoming port of a request is 80, the outgoing response of that request is also 80 (it is opened automatically) by default. |
| NACL can be used to support as well as deny rules. Denial of rules can be explicitly mentioned, so that when the layer sees a specific IP address, it blocks connecting to it. | They support rules only, and the default behaviour is denial of all rules. Every VPC can belong to different security groups. |
| It is considered to be the second layer of defence, which helps protect AWS stack. It is an optional layer for VPC, which adds another security layer to the amazon service. | It is considered to be the first defence layer that helps protect the Amazon Web Services infrastructure. |
| In case of NACL, the rules are applied in the order of their priority, wherein priority is indicated by the number the rule is assigned. | In case of a security group, all the rules are applied to an instance. |
| This means every rule is evaluated based on the priority it has. | This means all rules are evaluated before they allow a traffic. |
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