How to handle a router WAN not connected

1th step: First of all, the network operators provide access to the Internet cable plug in the WAN, and then a few share the computer connected to the LAN port, and then use a computer login router management interface for the corresponding configuration can be completed sharing the Internet.

2nd step: The router's WAN port does not pick up the network cable or network cable is not good.

3rd Step: The router's WAN port rate problem.

4th Step: Network cable issues, so that the router WAN interface network cable can be considered for a network cable.