How change IP of nodes

Hi I have been deployed a cluster using AWS EC2 with rancher 2.0, then I established elastics IP for my nodes, now I not have control of my cluster nodes from rancher, It show me for each node the initial IP. I restart and any change is visible. How I fix it. How I can change my IP? In dockerswarm each node take the new IP without problem, but in Kubernetes not, so for this reason I want to use elastic IPs, or is possible that my nodes can uses dinamics IP.