Numbered WAN interfaces on RGs is useful to manage v6-capable RGs. Dual-stack RGs can be managed through IPv4. However, with v6-only RGs or with dual-stack RGs with private only v4 address, RGs require a globally routable v6 WAN prefix (or address) for management. This feature provides support to assign WAN prefix to PPP based Layer 3 RG using SLAAC. The feature also adds a new RADIUS VSA (Alc-PPP-Force-IPv6CP, Boolean) to control triggering of IPv6CP on completion of PPP LCP. RA messages are sent as soon as IPv6CP goes into open state, and the restriction to hold off on sending RAs until DHCP6-PD is complete if a dual-stack PPP is no longer applicable.