To let a Mac automatically use Wifi and Ethernet to double the connection speed?
From Super User: If I have two internet connections on osx, how can I use both to increase my bandwidth?:


  Short answer: no. With 2 links, you have 2 IP addresses. It can be done with some specific higher end NICs (e.g. Intel quad cards), but they will appear to the rest of the network as a single IP address in that mode. If the assumption is that you have 2 distinct IP addresses, it cannot be done