Right - if you look at the code I included in my post, I was trying to convert anything that looked like Ethernet related to the equivalent Wifi or Yun code. But as yet, no luck.
I looked at the dragino2-Yun-common v2.0.6 firmware you referred to and it bares the same name and size as the one referenced in the Iduino Yun Shield Wiki - not certain how they differ but will reload anyway.