Hetzner Cloud Networking (Private Networks + Floating IPs + Firewalls)

Quake AI concept: Networking

• Hetzner's network model has three main primitives: Private Networks (L3 SDN), Floating IPs (public IP reassignment), and Firewalls (stateful L3/L4 rules). Neutron separates these into networks, subnets, routers, ports, floating IPs, security groups, and FWaaS rules as independently addressable resources.
• Hetzner does not have a concept of external networks, provider networks, or network types (flat/VLAN/VXLAN). All private networking is via Hetzner's proprietary SDN; Neutron supports multiple backend drivers (OVN, OVS, ML2 plugins).
• IPv6 on Hetzner private networks is not supported as of April 2026; only public interfaces can have IPv6 addresses. Neutron supports dual-stack subnets (IPv4+IPv6) on private networks.
• Hetzner network limits: max 100 servers per private network, max 50 private networks per project. Neutron quotas are operator-defined and typically much higher.