I am trying to configure port forwarding within Google Cloud in a similar fashion to an on premise firewall. I would like a single NAT address that I can then control a series of ports to go to specific VM instances.
e.g.
External 10.10.10.10 ports tcp 100 - 199 -> VM1 External 10.10.10.10 ports tcp 200 - 299 -> VM2 External 10.10.10.10 ports tcp 300 - 399 -> VM3 etc.
I can't use a LB as the only target VM which would accept those ports is the original.