Data forwarding method based on asymmetric routing under railway PSCADA network

The invention discloses a data forwarding method based on asymmetric routing under a railway PSCADA network, which comprises the following steps that: a dispatching station accesses an IP (Internet Protocol) network port corresponding to a router in a management machine through one channel and the router corresponding to the channel, and after data reaches a protocol stack of an operating system of the management machine, the data is forwarded to the IP network port corresponding to the router; a protocol stack of a management machine system captures a dispatching station message through an IpFilterHook () hook function, analyzes, records and stores a destination address of the message, then queries a routing table, finds out an IP network port corresponding to the destination address, and finally sends a reply message through the IP network port and then forwards the reply message to a dispatching station through another channel of a router corresponding to the IP network port. The method not only can effect