I'm not real sure about Envoy, but I know for a fact you can set up an ethernet network on one system and using IP-Nat configuration with MiamiDX for both systems to connect on one connection. All you need to do set up the main system (primary internet connection) to connect to the internet on one connection and the other connect to the 2nd computer. You will need to use a gateway of the 1st computer's IP address and a mask of 255.255.255.0. When you set the IP on both computers, set them up using either 192.168.0.* or 10.12.0.*; those are the standard local IP addresses where * is (1-255). It's been ages since I've used MiamiDX but I hope this helps. You should be able to read some of the tutorials on
http://www.nordicglobal.com or the Miami mailing lists.
:pint: