So, how do we make that jump? How do we get a smooth non-pressured transition to IPv6? The-- I would say now Cisco approved and recommended a way to make a transition is this guy, Dual-stack Routers. So, here is the idea, I can run-- I mean you can see right here on router one, let's do a show ipv6 interface brief. It shows these IPv6 addresses that are on there, right? So we're running ipv6, show ip interface brief, right? All completely unassigned, you want to see this method? Here it is in 30 seconds or less. We have just created a dual-stack router.