Also read - Best practices for GCP Firewall Rules and Firewall Policies in GCP
For a VM that lives in the default VPC, there are a few default firewall rules (Note that these are different from IMPLIED rules - which are basically all egress allowed and all ingress blocked)
- By default, Ingress (e.g. HTTP ingress) is denied.
- VM to VM traffic is always allowed.
- SSH and RDP inbound are allowed from all sources
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