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IBM Cloud VPC security group rules can name another security group as their remote instead of a CIDR block. Membership drives access, so tier-to-tier rules survive IP changes.
The goal is to prevent accidental public reachability of FoundationDB cluster ports while preserving internal client connectivity. FoundationDB storage and coordinator processes listen on TCP for cluster traffic and client connections, and the addresses recorded in the cluster file are used by clients to reach the cluster. Access control historically relies