- IPv6-only networks still rely on IPv4 subnets and ARP, which introduces operational costs and complexity.
- The IETF proposal introduces a sentinel IPv4 address (192.0.0.11) that allows IPv4 to operate over IPv6-only infrastructure without ARP or IPv4 subnets.
- ARP causes issues like storms, poisoning, and table exhaustion, while IPv4 addresses waste space and require subnet management.
- Some hosting providers already use non-standard solutions (e.g., Hetzner, OVHcloud, Scaleway), but lack interoperability.