Path detection method and device

The invention relates to a path detection method and device. The method comprises the following steps: sending a first message for detecting a communication path between gateway equipment and an edgerouter to the gateway equipment, wherein the first message includes a first path detection message, and the first path detection message is used for enabling the gateway equipment to forward a first path detection message after NAT (Network Address Translation) is performed by next-hop network equipment to the edge router through the next-hop network equipment; receiving a second path detection message sent by the gateway equipment within a preset time period, wherein the second path detection message is a message forwarded by the edge router to the gateway equipment via the next-hop network equipment, and the second path detection message includes a second detection identifier; and when the first detection identifier is matched with the second detection identifier, determining that the communication path between