Ensure zone resilient outbound connectivity with NAT gateway


Written by Aimee Littleton, Product Manager, Azure Networking


Our customers—across all industries—have a critical need for highly available and resilient cloud frameworks to ensure business continuity and adaptability of ever-growing workloads. One way that customers can achieve resilient and reliable infrastructures in Microsoft Azure (for outbound connectivity) is by setting up their deployments across availability zones in a region.


When customers need to connect outbound to the internet from their Azure infrastructures, Network Address Translation (NAT) gateway is the best way. NAT gateway is a zonal resource that is configured to subnets from the same virtual network, which means that it can be deployed to individual zones to allow outbound connectivity. Subnets and virtual networks, on the other hand, are regional constructs that are not restricted to individual zones. Subnets can contain virtual machine instances or scale sets spanning across multiple availability zones.


Even without being able to traverse multiple availability zones, NAT gateway still provides a highly resilient and reliable way to connect outbound to the internet. This is because it does not rely on any single compute instance like a virtual machine. Instead, NAT gateway leverages software-defined networking to operate as a fully managed and distributed service with built-in redundancy. This built-in redundancy means that customers are unlikely to experience individual NAT gateway resource outages or downtime in their Azure infrastructures.


To ensure that you have the optimal outbound configuration to meet your availability and security needs while also safeguarding against zonal outages, let’s look at how to create zone resilient setups in Azure with NAT gateway.


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