⁷Even if a node correctly generates, processes and forwards control traffic, it may act maliciously by not forwarding data traffic. The node thereby breaks the connectivity in the network; however, this connectivity loss is not detected by the routing protocol because control traffic is relayed as required. This type of situation may also be due to wrongly configured nodes: routing capabilities (through IP forwarding) are disabled by default in most operating systems, and need to be enabled manually. Failing to do so effectively causes data traffic not to be routed while control traffic, which is forwarded by action of the routing daemon, is correctly transmitted.