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This is covered in the docs: https://docs.k3s.io/cli/server#networking

--cluster-cidr value “10.42.0.0/16” IPv4/IPv6 network CIDRs to use for pod IPs

--service-cidr value “10.43.0.0/16" IPv4/IPv6 network CIDRs to use for service IPs

So if I don’t specify these values, k3s will auto assign them to an available address range. What happens if I manually make another seperate VLAN matching what k3s is using for its services and pods? Will k3s detect that and auto Change its addressing?

it doesn’t detect or auto assign anything. It is not finding an “available” address range. it just has defaults for flag values.