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SharpUPnP is a simple library to help forward ports using UPnP All of the methods in the SharpUPnP class are static so there is no need to initialize a class instance. Discover() Before you do anything, you must run the Discover() method. This tries to get the IP of your router, and then get the url of the UPnP service to send requests to. If there is no UPnP device available, the Discover() method will return false. FowardPort() The ForwardPort method takes 3 arguments: an int port number, a ProtocolType protocol, and a string description. The port number should be the port you are trying to forward. The protocol should be either Tcp or Udp. These are the two protocols that the router can forward to a device, and the one you choose should be the one that your program is listening for. The descrption is just a short string to describe what the port is being used for (generally the program name). DeleteForwardingRule() The DeleteForwardingRule method takes two arguments: int port, and ProtocolType protocol. This finds the forwarding rule with the corresponding port number and protocol, and erases it from the port mapping table. GetExternalIP() The GetExternalIP address does not need to be called for any of the other functions. It is called inside other code, but it might be of use to you for other purposes. This returns an IPAddress SOAPRequest() This method is if you want to make any other SOAP requests besides the ones I have provided The SOAPRequest method takes 3 arguments: string url, string soap, string function. The url should be the url of the UPnP service on your router. After calling the Discover method, this will be stored in _serviceUrl, and you can just pass that. soap should be the actual request xml that you are sending. function should be a string containing the name of the UPnP function you are trying to perform. This tells the router what the soap xml is for.