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IP Transparency with software install in GCP

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IP Transparency with software install in GCP

Has anyone had any luck with IP transparency using vTM in Google Cloud? In a packet capture taken on the vTM, I can see that the vTM is sending packets to the backend node with its own internal IP as the source rather than the public IP that the client came from. This seems to be the case whether using the software on Linux install or the Marketplace appliance. In both cases, I have configured IP Forwarding in GCP and on the vTM, as well as configuring iptables on the vTM to allow the backend node to use the vTM as its gateway, as well as setting up routes in GCP to direct traffic from the backend destined to the internet to use vTM as its next hop.