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The MAC drop-down box contains all the Network Interface Cards (NIC) available to your computer.  To test with a network connection on a different NIC, just pick a new NIC using this MAC drop-down until the IP address matches the network that you want to test from.  

Also, you may have a network connection available to your computer through a wired and wireless interface.  Make sure that you have the correct MAC address selected so you are testing with the desired connection.