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Azure NAT Gateway
NAT Gateway is a fully managed service that securely routes internet traffic from a private virtual network with enterprise-grade performance and low latency.
50 questions
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You do not configure NAT by using routing tables/custom routes (at least not directly). Instead, you need to configure the Security settings of the subnet, as described in https://learn.microsoft.com/en-us/azure/nat-gateway/quickstart-create-nat-gateway-portal
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hth
Marcin