AWS has updated cross-zone data transfer pricing for Network Load Balancers (NLB). Previously, enabling cross-zone load balancing incurred standard inter-AZ transfer charges ($0.01/GB each direction), which caused many teams to disable it despite the resilience risks.
You can now safely enable cross_zone_load_balancing.enabled = true on internal and internet-facing NLBs without fear of unexpected cross-zone bandwidth penalties during traffic surges.
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