Published Mar 18, 2023
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All subnets have a modifiable attribute that determines whether a network interface created in that subnet is assigned a public IPv4 address and, if applicable, an IPv6 address. This includes the primary network interface (eth0) that’s created for an instance when you launch an instance in that subnet. Regardless of the subnet attribute, you can still override this setting for a specific instance during launch.
After you create a subnet, you can modify the following settings for the subnet.
Auto-assign IP settings: Enables you to configure the auto-assign IP settings to automatically request a public IPv4 or IPv6 address for a new network interface in this subnet.
Resource-based Name (RBN) settings: Enables you to specify the hostname type for EC2 instances in this subnet and configure how DNS A and AAAA record queries are handled. For more information about these settings, see Amazon EC2 instance hostname types in the Amazon EC2 User Guide for Linux Instances.