Why might the number of active clients show as 0 when configuring a router as a DHCPv6 server?

• A. The state is not maintained by the DHCPv6 server under stateless operation
• B. No clients are connected to the network
• C. The DHCPv6 server is misconfigured
• D. There are too many clients requesting addresses

Answer: (A)

The number of active clients may show as 0 when configuring a router as a DHCPv6 server primarily because of the stateless operation of the DHCPv6 server. In a stateless configuration, the DHCPv6 server does not keep track of the state or the number of clients that request addresses. Instead, it allows devices to use IPv6 Stateless Address Autoconfiguration (SLAAC), where clients generate their own addresses using network prefixes provided by the router. Therefore, the DHCPv6 server is not aware of any active clients since it does not maintain a record or state of the address assignments.

Stateless DHCPv6 is typically used in scenarios where clients do not need to keep a lease or have an ongoing relationship with the server, unlike in stateful configurations, which do track lease states and client assignments. Hence, if a DHCPv6 server is operating in a stateless mode, it will not show any active clients, leading to the reported count of 0.

Other choices suggest potential issues that might affect client connectivity or server function, but they do not directly address the fundamental operation of DHCPv6 in stateless mode, which is the reason for the 0 count seen in active clients.