After digging in the net2 code i managed to write my own UDP based server, it is listening ok. But I cant write the client side, the UDP packet it is never sent. This is what I do: SDLNet_ResolveHost(&serverIP,"192.168.1.1", 1515); servsocket = SDLNet_UDP_Open(0); //Works fine, socket is opened chan = SDLNet_UDP_Bind(servsocket, -1, &serverIP); //Channel always returns 0, no error packet=SDLNet_AllocPacket(128); //I got a non-null value packet->data[0]=1; SDLNet_UDP_Send(servsocket,chan,packet); //and this always return !=1 But no data is received. Can somebody tell what is wrong here?

Yes, that was the problem! I managed to miss that in the docs.