understanding azure nat gateway inner working

 This article is really good to get a deeper understanding how it works.

https://azure.microsoft.com/en-us/blog/dive-deep-into-nat-gateway-s-snat-port-behavior/

A few take away  for me at least are 

1. Nat gateway can be associated with multiple subnet. This means it can link more than a single subnet. 

2. If you have a VM with public IP in that subnet. Incoming connection can go directly to the VM while all outgoing request flow out via Nat gateway. 

3. Connection can be re-use if it goes into a different destination.

4. It can support up to 16 different IP.


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