The problem of IP address is difficult, please enter 50 for masters

Your question doesn't seem to be very clear, why it involves switching between LAN and WAN (WAN is what you call the Internet).

Then I said according to my understanding:

First of all, the problem of computer network selection: the IP acquisition speed of LAN is very fast, while the WAN is very slow to choose IP speed due to the increase of bit error rate.

When two connections exist at the same time, the computer will only take the IP address that obtains the fastest speed as its own IP, and the computer itself cannot have two IP modes, the internal network and the external network, so only one can be selected.

In fact, this explanation can already solve your problem.

Then, when the LAN connection is disabled, the computer can only get the address from the WAN connection, so it can be accessed normally.

And, according to your description, there seems to be no network connection between your LAN and WAN, that is, it is not an intranet connection to an external network mode, so you cannot access the WAN by using the LAN address, and the WAN server will default to your data as illegal data, because the LAN retains the IP field and does not belong to the WAN.

If it is not as I understand, it is an intranet to extranet mode, you need to adjust the LAN server so that it allows LAN address decoding.

It is a special address, which is generally the default address of the network device when it leaves the factory (generally not used as a LAN IP). When the computer is turned on, Windows will look for the information of the network device, and the possible information is still there, so there will be a situation where the IP address and gateway are all LAN.

As for the solution, just follow your method, I personally can't find a better way.

Actually, I don't really understand it either).

First, set the gateway of the network to : and DNS to the routing IP.

The main reason is that the gateway and DNS are incorrect, so you can't connect to the LAN. Let's try this. It should work out.

I think this is normal.,The network cable is changed back and forth.,IP is automatically obtained.,The windows system sometimes can't react.,You need to disable it and enable it again.,It's equivalent to a refresh action.。

You should have set the default connection method yourself.

Removing the default connection method should be fine.

Then I won't copy, you can continue to despise me.