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GCP allows a VM to have multiple NICs, but firewall rules are governed by TAGS which unfortunately are attached at the VM level, NOT at the NIC level. So how would I configure totally different firewall rules on each NIC, given that tags only work on the VM level? Also in my case each NIC is in a separate VPC. Google's documentation is less than helpful.

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Google Cloud does not support attaching multiple NICs to the same VPC. Each Firewall rule is associated with one VPC.

So how would I configure totally different firewall rules on each NIC, given that tags only work on the VM level?

Create separate Firewall rules for each VPC.

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