
    Amazon VPC now allows users to set a primary IPv6 address on an elastic network interface, making the first IPv6 address immutable and providing consistent routing similar to IPv4 addresses.


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<p>
AWS has introduced support for primary IPv6 addresses on Elastic Network Interfaces (ENIs) in Virtual Private Clouds (VPCs), providing enhanced network management capabilities:
</p>
<ul>
<li>The first IPv6 address on an ENI can now be set as immutable</li>
<li>Primary IPv6 address cannot be removed while the ENI is attached to an instance</li>
<li>Supports both Amazon-provided and Bring Your Own IP (IPv6) addresses</li>
<li>Similar to IPv4's primary address routing mechanism</li>
<li>Enables consistent traffic routing without address changes</li>
</ul>
<p>
The feature is available across all AWS commercial and GovCloud (US) Regions at no additional cost, offering improved network stability and predictability for IPv6 deployments.
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