I just wanted to thank SomeJoe for this great tutorial. I can confirm that these steps work perfectly for the new flagship Centria (WNDR4700) from Netgate. It took me a couple of reboots of the Netgate on step 8 before it would pick up the IP, but other than that the setup was flawless! Thanks again!

Edit: I actually have the 2wire i38HG unit with the iNID outside of the house.