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yesterday i got a chance to look at this again. I installed Rancher on my laptop (in a different subnet because it was on wfi), updated the cluster_registration_url and harvester was able to register ok. When i tried Rancher on Harvester, they were both running in the same 192.168.20.0/24 subnet. Is there a limitation that i can not setup a vlan network on harvester that overlaps with it management subnet ?

If you set a VLAN with ID 1 you can have VMs on same network as your Harvester nodes - I have Rancher on a VM in Harvester able to manage Harvester (it's not supported but it works for my home lab)