Jeez I don't know what to say. The only way I figured it out was to be able to see the big picture. Little bits and pieces never worked for me in the past. This might be what you have to do.
To me it is a matter of bindings and network protocols and workgroups, all pointing to each other. Not using ICS with a router.
When I first started I didn't have anyone to ask so I made a networking page and copied all pertinent info on there. That way I wasn't bouncing around to different sites picking up bits here and there. My page only makes sense to me.