Probably you NAT is an ADSL modem instead of an IP router. Try Open.NAT and please read it documentacion.
I hope it can help you. If it doesn't work (doen't worry, it will) enable the tracing with verbose level and open an issue in github.
Question
Hi guys any one can help me with mono.nat dll , i do what this url said but nothing happens , upnp is activated in my router but i get no result. url : http://www.fluxbytes.com/csharp/upnp-port-forwarding-the-easy-way/
Solution
Probably you NAT is an ADSL modem instead of an IP router. Try Open.NAT and please read it documentacion.
I hope it can help you. If it doesn't work (doen't worry, it will) enable the tracing with verbose level and open an issue in github.