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Network ACL In AWS

In this article, we will discuss network ACL in AWS.

What Is Network ACL?

A network ACL is the optional layer of security for VPC. The network ACL acts as a firewall for controlling the inbound and outbound traffic of the subnet.

Default Network ACL

Each VPC contains the default network that allows all the inbound and outbound IPV4 and IPV6 traffic. To check the default network ACL, go to the details screen of VPC.

In the details screen, there is a field called Main network ACL

Picture showing the Main Network ACL attached to VPC

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When you click on the network ACL link, you can see the Default column as Yes.

Picture showing the value of Default column of Network ACL as Yes

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Inside the network ACL, you can see the default inbound and outbound rules.

Picture showing the default inbound rules in network ACL

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Picture showing the default outbound rules in network ACL

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How To Create A Custom Network ACL?

To create a custom network ACL, click on Security → Network ACLs in the VPC dashboard.

Picture showing the Network ACLs menu in the VPC dashboard

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In the network ACL screen, click on the Create Network ACL button.

Picture showing the Create Network ACL button for creating the new Network ACL

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The Create network ACL screen will appear. Enter the Name, select the VPC and click on the Create network ACL button.

Picture showing the Create network ACL screen

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The network ACL is created.

How To Change The Network ACL Of A Subnet?

To change the network ACL of a subnet, go to the details screen of the subnet. In the details screen, click on the Actions → Edit network ACL association.

Picture showing the Edit network ACL association option for changing the network ACL association

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A screen will appear where you can select the network ACL of the subnet.

Picture showing the Edit network ACL association screen for selecting the different VPC

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Click on the Save button to complete the association.

Posted By -	Karan Gupta

Posted On -	Tuesday, February 8, 2022

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