AWS Lambda networking over IPv6

AWS Lambda has introduced support for dual-stack IPv6 networking, offering several key benefits and transition strategies for serverless applications:

• Eliminates need for NAT gateways when Lambda functions require internet connectivity
• Provides cost savings by using free egress-only internet gateways
• Offers improved network efficiency and direct client connections
• Future-proofs architecture for IPv4 address exhaustion

To transition, organizations must:

• Assign IPv6 CIDR block to VPC and subnets
• Update route tables and security groups
• Enable dual-stack networking for Lambda functions
• Consider blue/green deployment for minimal disruption

This transition helps address IPv4 exhaustion while providing immediate operational benefits and long-term network compatibility.