
AWS VPC Block Public Access enables secure IPv6 infrastructure by providing declarative controls to block internet traffic while maintaining flexibility to adjust connectivity models using various IPv6 addressing options including BYOIPv6, Amazon-provided addresses, private GUA, and ULA.


<div><p>This article provides best practices for securing IPv6 infrastructure on AWS using VPC Block Public Access, covering multiple IPv6 addressing approaches and security strategies.</p><ul><li>BYOIPv6 GUA with VPC BPA offers flexible control over internet advertisement and access</li><li>Amazon-provided GUA addresses require VPC BPA to maintain private access controls</li><li>Private GUA and ULA are irreversible choices; require NPTv6 for future internet access</li><li>VPC BPA can block bidirectional or ingress-only traffic with granular subnet exclusions</li><li>Combine VPC BPA with Service Control Policies to prevent IGW/EIGW attachments</li><li>Use security groups, NACLs, and VPC flow logs for defense-in-depth security</li><li>Traffic inspection requires VPC BPA exclusions for firewall subnets</li></ul><p>The article recommends BYOIPv6 GUA with VPC BPA as the optimal approach, balancing flexibility, control, and operational simplicity for evolving IPv6 infrastructure needs.</p></div>


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