Everything your servers do on the network is set up under Networking in the console. It looks like a lot of separate pages, but they fit together simply.
- Private Networks are the internal networks your servers talk on. Every project gets one by default.
- Cloud Routers connect a private network to the internet and to other networks.
- Public IPs (Floating IPs) are the public addresses you attach to a server so the outside world can reach it.
- Security Rules are the per-server firewall that decides which ports are open.
- Firewall Rules are an optional network-wide firewall on top of that.
- Load Balancers spread traffic across several servers.
- VPN as a Service links your own office or another network privately to your cloud.
- Network QoS limits bandwidth where you need to.
- Network Map draws the whole thing so you can see how it connects.
A typical setup is: servers on the default private network, a router giving them internet access, a public IP on the servers that need to be reachable, and security rules opening just the ports you use. Start with Private networks and subnets and Public IPs.