[Other] loopback question

[jonathan508]

Any one know this solution for routers without loopback?https://www.google.es/url?sa=t&sour...-DIDV5o2OScJHgnVSykGWTg&bvm=bv.47244034,d.ZG4

Or this:
https://www.google.es/url?sa=t&sour...5kAUDXQEvNR2YOEz_0b8tJQ&bvm=bv.47244034,d.ZGU
https://www.google.es/url?sa=t&sour...5kAUDXQEvNR2YOEz_0b8tJQ&bvm=bv.47244034,d.ZGU