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double vs single NATing in gcp for outbound internet gateway

L1 Bithead

We're attempting to deploy a VM series in GCP to act as an outbound internet gateway. All documentation we've been able to find shows the Palos NATing the original source IP to another private IP in a 'public dmz' subnet. GCP will then NAT this new private IP to a public IP to traverse the internet. 

 

Has anyone had any success with a deployment where the Palos handle the single NAT of the original public IP to the new private IP? Seems like the private to private NATing the Palo does is unnecessary. 

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