Improve outbound connectivity with Azure Virtual Network NAT


Written by Aimee Littleton, Product Manager, Azure Networking


For many customers, making outbound connections to the internet from their virtual networks is a fundamental requirement of their Azure solution architectures. Factors such as security, resiliency, and scalability are important to consider when designing how outbound connectivity will work for a given architecture. Luckily, Azure has just the solution for ensuring highly available and secure outbound connectivity to the internet: Virtual Network NAT. Virtual Network NAT, also known as NAT gateway, is a fully managed and highly resilient service that is easy to scale and specifically designed to handle large-scale and variable workloads.


NAT gateway provides outbound connectivity to the internet through its attachment to a subnet and public IP address. NAT stands for network address translation, and as its name implies, when NAT gateway is associated to a subnet, all of the private IPs of a subnet’s resources (such as, virtual machines) are translated to NAT gateway’s public IP address. The NAT gateway public IP address then serves as the source IP address for the subnet’s resources. NAT gateway can be attached to a total of 16 IP addresses from any combination of public IP addresses and prefixes.


Figure 1: NAT gateway configuration with a subnet and a public IP address and prefix.Figure 1: NAT gateway configuration with a subnet and a public IP address and prefix.


Customer is halted by connection timeouts while trying to make thousands of connections to the same destination endpoint

Customers in industries like finance, retail, or other scenarios that require leveraging large sets of data from the same source need a reliable and scalable method to connect to this data source.


In this blog, we’re going to walk through one such example that was made possible by leveraging NAT gateway.


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