
AWS Network Load Balancer data transfer costs can be optimized by enabling 100% zonal affinity for client traffic and disabling cross-zone load balancing to keep traffic within the same Availability Zone, reducing inter-zone charges from $0.01-$0.04 per GB.


<div><p>This article provides strategies to optimize data transfer costs when using AWS Network Load Balancers (NLBs) by managing inter-zone traffic.</p><ul><li>Inter-zone data transfer costs $0.01 per GB in each direction ($0.02 total per GB)</li><li>Enable 100% zonal affinity to keep client-to-NLB traffic within same Availability Zone</li><li>Disable cross-zone load balancing to avoid inter-zone charges between NLB and targets</li><li>Maintain balanced client and target distribution across Availability Zones</li><li>Implement Availability Zone Independence for cost savings and resilience</li><li>Use EC2 Auto Scaling, ECS, EKS, or Elastic Beanstalk to manage capacity per zone</li><li>Monitor performance and adjust strategy based on application requirements</li></ul><p>By implementing these configuration changes and architectural patterns, organizations can significantly reduce inter-zone data transfer costs while maintaining high availability and performance.</p></div>


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