Is it possible to give nodes Internal IPs after the cluster has been created?

can you edit your question into a single message, so people can use the thread feature to respond? What do you mean by internal IPs? if you mean cluster IPs, only pods and services have cluster IPs.

So, each node has an option to specify a External IP & Internal IP. We’ve recently setup an internal VPN for our dedicated nodes and I want to change their configs to bind on these Internal IPs rather than the External ones for the Kubernetes services. I know it’s possible to set Internal IP, I’m just not sure if it can be set after a node has been added.

are you specifying those in rancher? I just use DHCP, so I don't know 😄 Never cared much about which specific IP my nodes get. The concept is that you are able to throw them away and recreate them at any time anyway. Static IPs are somewhat antithetical to that