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https://docs.rke2.io/reference/linux_agent_config#networking

node-external-ip IPv4/IPv6 external IP addresses to advertise for node

addresses I guess that's the answer?

yes. plural.

it's a bit subtle

if it only supported one it would be singular

Well, I appreciate the response. I think it would be clearer if the docs were explicit about:

one of each family

in preferred order

note that these are only used if you’re using the rke2 built-in cloud provider. If you use an external cloud-provider (vsphere, aws, etc) then the cloud provider is responsible for returning whatever internal and external IPs are known for the instance.

I believe that's what we are doing. We are certainly passing those flags, and the IPs specified are what's registered.