Connect Slingbox to Roamio using ethernet port on Tivo...

I have a 2nd Tivo Roamio in my living room that's connected via Moca from my Roamio in my bedroom.

I read that you can use the ethernet port on the back of the Roamio to provide internet to another device. Has anyone tried that? Do you think it would work with a Slingbox?

Thanks for any tips.