Because many manufacturers have with ADSL dial-up routing Mode，Especially when the cat's default IP-192.168.1.1（Such as Huawei  MT800, such as Chia Tai HUAHONG）Easily conflict with the router，

A result of the success can not dial-up，Or call the network on its intermittent，Dial-up Mode at this time will be replaced by the proposed bridge mode，Instead of bridge mode，Router mode can not have the same IP，Router mode can not have the same IP.