The broadband account has been cancelled, the internal network of the router is still connected, and the printer NAS can still be used.

I was helping a relative to deal with an old house. I decided that I didn’t want the 300Mbps telecom broadband. The business office I ran with had to cancel the account on the spot. On the way back, I was thinking about something: The router, printer, and old computer at home contain photos. What will happen after the account is closed? When I got home and turned on my phone, the WiFi name was still there, the signal was full, and the connection went smoothly. 192.168.1.1 You can also enter the background - just open any web page and spin around. That night I went through the network at home from beginning to end, and found that the line between broken and live is different from what most people think. This article will draw this line clearly.

Handle the equipment first: The main router is an old TP-Link XDR3230, the network cable drags an Epson L3153 printer, and an old Dell desktop is used as a warehouse for storing photos. Before the cancellation of broadband accounts, optical modem bridging and router dial-up were used for two or three years.

Make it clear first: The only thing that was broken was the way out, the house didn't collapse.

What will the operator do after canceling the account? It is the authentication of that string of broadband accounts. The optical modem is still glowing, and the router is still running, but the PPPoE dial-up in the router will never go up - if you look at the WAN port status in the background, it will be stuck on the three words "Connecting" in a loop, redialing once in a while, and redialing again in a while. If you want to see the status page fields, How to determine who is dialing from WAN port IP As I wrote in that article, what you see after canceling your account is the cycle of incorrect account and password.

But the router box itself is a small computer. Its WiFi broadcast, DHCP address sending, and exchange between the four LAN ports are all local functions and do not rely on the external network. The fact that the mobile phone can get the address of 192.168.1.x when connected to WiFi is direct evidence that DHCP is still working. Therefore, "WiFi is connected but cannot connect to the Internet" is not a fault in the scenario of canceling the account, it is a normal state. Don't think that the router is broken and poke the reset hole as soon as it comes up.

One more thing to say here: Striking reset is the worst move. The configuration file stores your home WiFi name and password, broadband account, DHCP settings, etc. Back up configuration before reset It has always been my habit, and the day of account cancellation is especially important - because once the account is cancelled, the broadband account password cannot be retrieved, and there is no reference for checking anything after reset.

Which things are still alive, I tried them one by one

That night I tried everything I could at home, and the results are recorded in the table below. Give conclusion first: As long as the devices are connected to this router (either WiFi or network cable), the internal network will not be interrupted.

What surprised me the most was the printer one. This Epson mobile phone can be directly connected to print by installing an app. I always thought it was through Epson Cloud. After actually checking it, I found that when the mobile phone and the printer were both under the same WiFi, the App found that the printer relied on local broadcast and the print data was directly transmitted from the intranet and did not go out at all. On the night I closed my account, I typed three test pages and they came out instantly. There was no delay in typing the winter vacation homework papers for my relatives' children.

The same goes for the desktop computer. Install a file management app on your phone and enter \\192.168.1.106 You can browse shared folders at the same speed as before you closed your account, and you can transfer photos at more than ten megabytes per second. The devices in the home LAN access each other through the switching and forwarding of the router, which has nothing to do with the broken optical fiber outside.

There is a pit: The mobile phone will secretly cut the traffic, and you think the internal network will not work either.

On the first day of trying out the intranet, I almost made a misjudgment. I couldn't type out the test papers when I connected my phone to WiFi. I thought the internal network was also down, so I struggled for a long time. Later, I saw the traffic mark on the notification bar - the phone detected that the WiFi was "unable to access the Internet" and automatically switched to traffic. The network it was on was no longer the network at home, and of course it could not access the 192.168.1.x printer.

Android's WLAN Assistant and Apple's "Wireless LAN Assistant" both have this logic. If the WiFi is disconnected, it will silently use traffic to top it up. Normally this is a good thing, but when verifying the intranet it is purely troublesome. Before verifying, turn off this switch, or simply temporarily turn on airplane mode and then turn on WiFi alone to ensure that the phone stays in the home network.

Another situation is the problem of mobile phone DNS. After canceling the account, some mobile phones will also judge DNS resolution as a failure, and accessing the shared folder using the host name will fail. Don’t use the host name at this time, access directly using IP: \\192.168.1.106 In this format, the IP does not go through DNS and is the most stable. The fixed IP of that desktop computer was assigned to me in the early years. Assign a static IP to the printer NAS in the router This article has written about the method, and the benefits of tying are now fully realized - the address will never change, and everyone who visits will copy it.

If you want this intranet to run for a long time, change these settings

After confirming the value of the intranet and preparing it to run for a long time in a house without broadband, there are four settings worth touching. I went back to get it for my relatives on the third day after closing my account, which took about 20 minutes.

The first is to change the router's Internet access method from PPPoE to "obtain IP automatically" or simply ignore it. Failure to dial the number does not affect the internal network, but the router will redial it day and night, hundreds of times a night, which is in vain. If some machines fail to dial up, system notifications will pop up in the background and the indicator light will flash orange, which is annoying to watch. Change it to automatic acquisition, and the WAN port status will be clear and refreshing. If you want to get broadband again in the future, just change it back. If you forget your account password, Five ways to retrieve your broadband account password There is a method in that article. If you cancel the account and reset it, it will be a new account. The old one is really irretrievable.

The second place is to unplug the optical modem. All accounts have been closed, and the cat alone will have no effect other than generating heat. The optical modem is the operator's asset. When canceling the account, the master will ask if the equipment can be returned. If you can, return it. If you can't, put it away yourself and don't turn on the power. Its several LAN ports can theoretically be used as switches, but if the router ports are sufficient, don't create extraneous problems.

Third, check the router’s time settings. After the network is disconnected, if the router cannot obtain the NTP time, the system time will slowly drift. Some machines will directly reset to zero after powering off and restarting. If the time is wrong, the functions of switching WiFi on and off at a scheduled time and restarting at a scheduled time are all messed up - my relative’s phone has a rule for disconnecting the child’s tablet from the internet at regular intervals. Which router has this problem and how to deal with it? If the scheduled network disconnection is not executed, the system time will be reset to zero. I’ve written it before, so I won’t repeat it here.

Fourth, expectations related to cloud functions will be lowered. If you have tied a TP-LINK ID or a cloud app like Mijia, you cannot use it for remote management - the router itself cannot get out of the internal network, and the instructions from the app cannot be transmitted in. This isn't broken, it's just a physical impediment. One day I passed by the house and connected to WiFi, and the local management was as usual.

What else can this "home without external network" be used for?

At that time, my relatives' children were on winter vacation and they relied on this intranet to get by. I observed that it could do more things than I thought. The print job does not require any external network, as mentioned earlier. There are dozens of gigabytes of old photos stored in the desktop computer, and you can browse them on your phone while lying on the sofa. Later, I also connected an old laptop to it and used it as a second photo backup point. The two machines copied each other in the middle of the night, and it ran smoothly. How fast can you transfer files over a local area network and how can you test it? Use iperf3 to understand the internal network That article was written more carefully than mine.

Those who can't do anything have to go out.: Synchronize online videos, web pages, WeChat, and cloud disks, all at once. My child is not affected at all when playing stand-alone games on a desktop computer. He even asked me if my network was "stuck". He couldn't sense the disconnection at all because the game was not connected to the Internet at all.

I did some calculations by the way. For this pure intranet usage, the cost is the electricity bill for the router and printer, which is a few dollars a month. If a broadband is reserved specifically for this internal network requirement, it would cost more than 1,000 yuan a year just to have WiFi access, which is not worth it. When you really need to use the external network temporarily, it is most cost-effective to turn on the hotspot for a while on your mobile phone. Just insert a USB wireless network card into your desktop to connect to the hotspot.

Take your seat: Actions in each of the three situations

Finally, wrap up the things that should be done before and after closing the account in order. Divide the three situations into the correct seats, don’t be too verbose, if the order is wrong, it will really be in vain.

One more word about the step of copying the broadband account before canceling the account.: That string kh开头的账号 Write it down in the WAN port settings of the router, go in and take a look and copy it down. It’s not that you can still use it after canceling the account, but if you have a fee dispute with the operator in the future, you can have the account in hand for verification. Where can I check the broadband account in the router? Auto dial settings There is an entrance path in that article.

In the third case, if you want to reinstall broadband, you will basically have to go through the wizard again after the installation and maintenance comes to your door. Complete sequence of redialing after reset That article was written for this kind of scenario, just follow it through. As for the pure intranet situation, the biggest inner demon is actually "if there is no network, all these devices will be useless" - really not, they just can't get out, and this group of people in the house is living well.