Ok, I'm going to humble myself here. I have 4 class c IP blocks. (12.X , 13.X , 14.X , 15.x), and my cisco is (of coarse), 12.1. Now, have many routers on client end/s. And when on any other block other than 12.X, the "cheap" routers won't take ip's on different blocks then the gateway. (Age...