The client by the router to the server to send a UDP per minute heartbeat packets, after the server receives a heartbeat packets will return response packet to the client, and send some data in the past, recently encountered such a problem, my server is to use the telecom broadband connection , when the client using the mobile broadband connection, the server receives a heartbeat packets, but returned to the data of the client is always cannot receive, see received a heartbeat packet's IP and port will always change, such as the client USES the telecom broadband connection is no problem, I ask you who have any good solution!!!!!!

The search on the net, some mention of mobile broadband dial-up sent data is not exposed to the network real public IP, says what mobile broadband dial-up Internet distribution network IP, don't understand, someone explain!!!!!!