Currently the P2P mode supports bidirectional connections (e.g. InitiatorAndResponderDiffusionMode), however if a remote peer which is in its configuration file (e.g. a local root peer) is behind a firewall, the outbound governor will try to poll until the remote peer connects. The idea is to add a new peer category to the network topology file: peers which we do not connect to, but wait until they connect to us before we start use them as upstream peers.