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Users can create a firewall policy in the myCloud view in Virtual datacenters or in the Global view. See See the GCP entity naming conventions in https://abiquo.atlassian.net/wiki/pages/resumedraft.action?draftId=311378206 for details of acceptable firewalls names. 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.
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