...
Users can create a firewall policy in the myCloud view in their virtual datacenters or in the Global view. Remember that GCP only allows lowercase letters, numbers, and dashes in the firewall name only. GCP Firewall rules must be in a single direction (ingress or egress) and type (allow or deny). You can add multiple protocols in the same firewall direction. And you must set a priority, where the default is 1000, and lower numbers have higher priority. You can also enable firewall logging.
...