I want to install OS patching on my Windows Compute Engine instance that has no external ip address. I have found one option that is Cloud NAT. Is there any alternative of Cloud NAT for installing the patches on Compute engine instance?
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This tutorial: Deploying centralized VM-based appliances using VPC network peering shows how to set up a central NAT instance to route traffic from private VMs in multiple peered VPCs in a hub-spoke topology.
This approach might be useful when you want to set up centralized NAT for private VMs in multiple VPCs or for VMs with multiple network interfaces.