Hello.  I am new to Snort and was able to bring up a functioning IDS using your really easy to follow guide.  This is an amazing learning experience.  Using some of the other posts, I was able to go in and change credentials so it is a bit more secure.  After the successful install, a requirement was added to have the box monitor multiple taps on 2 interfaces.  Being new, I have scrambled around and found that it is possible by running multiple Barnyard2 & Snort instances.  I have read Snort can run multiple instances inside itself on the one box. As long as you have separate Snort.conf files for each interface with a matching Barnyard2 instance logging will be fine.

My issue is that I am struggling to figure out how to make this happen within the context of your guide.  Any help that anyone could give me would be greatly appreciated.  

 I have also seen bridging NICS can sort of lead to a similar result, but I wasn't sure if that was a viable option.

You will need to bridge the two NIC's and in Windows 10 do it as below:

Bridging Your Internet Connections on Windows 10

Step 1: Go to your Control Panel from the Start menu.

Step 2: Navigate to Network Connections.

Step 3: Click on the first NIC that you want to bridge.

Step 4: Hold down the CTRL key while clicking on the second NIC that you want to bridge.

Step 5: Right-click on one of the selected NICs and click "Bridge Connections."

I have not tested the above on anything other than Windows 10.