Ensure that you place the deny rules earlier in the table than the allow rules that open the wide range of ephemeral ports. The inbound direction of the clients security group is irrelevant. However, you can also add rules to the ACL to deny traffic on any malicious ports within that range. In practice, to cover the different types of clients that might initiate traffic to public-facing instances in your VPC, you can open ephemeral ports 1024-65535. If an instance in your VPC is the client initiating a request, your network ACL must have an inbound rule to enable traffic destined for the ephemeral ports specific to the type of instance (Amazon Linux, Windows Server 2008, and so on). AWS Lambda functions use ports 1024-65535.įor example, if a request comes into a web server in your VPC from a Windows XP client on the internet, your network ACL must have an outbound rule to enable traffic destined for ports 1025-5000.Windows Server 2008 and later versions use ports 49152-65535. AWS Network ACL Rules (both inbound and outbound) are defined in terms of the DESTINATION port The numbering can start at one and go as high as 32766.Windows operating systems through Windows Server 2003 use ports 1025-5000. The related to an end-client is why we need to set ephemeral ports range. This can be very easy to forget, so this module adds not only the inbound ports to an ACL, but also the ephemeral outbound ports for return traffic.Requests originating from Elastic Load Balancing use ports 1024-65535.Many Linux kernels (including the Amazon Linux kernel) use ports 32768-61000.
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