When assisted-service checks for connectivity between nodes when UserManagedNetworking is enabled, it requires that every IP address on each node is reachable from every other node.

When UserManagedNetworking is enabled, we only check for connectivity at Layer 3. So it is likely that any secondary interfaces on the hosts maybe connected to networks that are not routable from each other.

We should only check for connectivity to the IP(s) that will be used as the kubelet IP. Before calculating the majority groups, we could likely discard:

• IPs that are not in a machineNetwork
• IPs in a machineNetwork other than the one on the interface with the default route