Each rule contains the following elements: Inbound rules determine what traffic is allowed to ingress the subnet. Related Products:– AWS Certified Solutions Architect | Associate Inbound Rules The stateless nature of the NACL is why each one is preconfigured with rules to allow all inbound and outbound traffic, as discussed in the following sections,VPC Network Access Control Lists. This is much like an access control list (ACL) on a traditional switch or router. Unlike a security group, which is stateful, a NACL is stateless, meaning that it doesn’t track the state of connections passing through it. You can also associate the same NACL with multiple subnets, provided those subnets are all in the same VPC as the NACL. You can modify the default NACL, or you can create a new one and associate it with the subnet. When you create a new subnet in a VPC, the VPC’s default NACL is associated with the subnet by default. A subnet can have only one NACL associated with it. If you want to do that, you have to use security groups. This means that NACLs can’t be used to control traffic between instances in the same subnet. The NACL associated with a subnet controls what traffic may enter and exit that subnet. Instead of being attached to an ENI, a NACL is attached to a subnet. A NACL differs from a security group in many respects. Also, each VPChas a default NACL that can’t be deleted.But the similarities end there.
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