nat-loopback

Is there any protocol like UPnP for router Loopback? (Loopback NAT)

We can use UPnP protocols to Forward users port. SO TO DO SIMPLE NAT TRAVERSAL. But problems appear after such operation. My main point is - you can forward users port - bind it to globall adress, you can acsess it from glogal internet, but you can not from local network (ower the NAT). So I wonder if there is some protocol set that al...