回复：打雷的时候，俺确实在用router，

According to your posts, your computers were connected to internet via modem/router combo before 雷击. Now your primary computer is connected to modem only and you are getting limited connection. This is the computer you used to run first time setup procedure for your high speed internet connection, right?

In the future, in case you might need switch to connect additional computers, you should NOT connect your primary computer (the one used to run one-time setup procedure) via SWITCH. Otherwise, you will get same error.