1. A method, comprising: receiving, at a border node between a reactive routing network and a proactive routing network, an inter-domain route request (RREQ) from a requestor for a destination; determining whether the destination is known to the border node; in response to knowing the destination at the border node, responding to the requestor; and in response to not knowing the destination at the border node: when the border node is ingressing the inter-domain RREQ into the proactive routing network, sending the inter-domain RREQ to each other border node of the proactive routing network; and when the border node is ingressing the inter-domain RREQ into the reactive routing network, sending the inter-domain RREQ into the reactive routing network.