Pool of client IPv6 addresses Pool of addresses used to assign to clients ipv6net IPv6 address and prefix length Prefix length used for individual client u32:48-128 Client prefix length (default: 64) Subnet used to delegate prefix through DHCPv6-PD (RFC3633) ipv6net IPv6 address and prefix length Prefix length delegated to client u32:32-64 Delegated prefix length