What should I do if I change the router LAN port IP and forget the new address? Four ways to get back the background, reset is at the end

Last year, I changed the network segment for a friend’s house, and the IP address of the router’s LAN port changed from 192.168.1.1 move to 192.168.6.1 , in order to avoid fighting with the VPN network segment of the company upstairs. At that time, after changing and testing, everything was normal, so I patted my butt and left. Five days later he texted me on WeChat: I can't enter the backstage. 192.168.1.1 I have been knocking around for a long time, wondering if the router is broken and should I reset it.

The router is very good. Changing the LAN port IP is equivalent to changing the house number of the router. 192.168.1.1 That door was no longer in use, but he was still standing at the old door knocking on the door. They had moved to 6.1 long ago. The trouble was that I didn't let him copy down the new address after I changed it. Five days later, neither of us could remember what it had been changed to. After wandering around for ten minutes, I found it. This article will clearly describe the four paths from "smallest to largest cost". If you follow them, the first one will give you the answer in 90% of cases.

The first move: Look at the mobile gateway and get the answer in one minute

This is the trick I use most smoothly. Connect your phone to your home WiFi, go to settings and click on the WiFi details page: In Android, click on the name of the currently connected WiFi in "Settings-WLAN", scroll down and there will be "Gateway"」 ； On iPhone, click the exclamation mark in "Settings-WLAN" and look at the "Router" column. Some brands have different names. Xiaomi calls it "router address", OPPO and vivo call it "gateway", but they all mean the same thing.

One word of principle: When DHCP sends an address, the gateway always follows the new house number of the router. Router changes the LAN port to 192.168.6.1 , the gateway column is automatically written in the configuration sheet it sends to the mobile phone. 192.168.6.1 . So the number shown in this column is the backend address. This is the most reliable clue in the entire network, more accurate than any memory.

That night I asked him to send me a screenshot, and the gateway column clearly stated 192.168.6.1 . Type in the browser, the login box pops up directly, and you're done. The whole journey takes less than a minute.

There is a premise that needs to be explained here: Your mobile phone must be connected to the WiFi sent by this router. If you still have the optical modem network at home (the name usually starts with ChinaNet or the operator's prefix), if you connect to the wrong gateway, you will see the optical modem address, and your work will be in vain. How to tell which machine manages each of the several networks at home? I'm here Can't enter the backend even though I'm connected to WiFi In that article, I wrote about the judgment idea using the gateway method. The same method can be used in reverse.

The second move: ipconfig on the computer, two lines of commands to review

If you have a computer nearby, it will be more stable to review it. In Windows, press Win+R and type cmd, enter ipconfig , look for the line "Default Gateway" ； Open terminal on Mac and type netstat -nr | grep default , followed by default is the gateway. It doesn't matter if it's connected to WiFi or plugged in with a network cable, as long as the computer is connected to the network under the router.

I also tried it at home: Change the LAN port of that AX3000T to 192.168.5.1 , when I looked at ipconfig on my computer, the default gateway immediately changed to 192.168.5.1 , the IP address also jumped from the 1.x segment to the 5.x segment. Compare the two rows of numbers to confirm that the new house number is correct.

There is one exception to this trick that you should be aware of.: For computers that have been manually configured with a static IP, the gateway is hard-coded and will not follow the new segment. The old desktop computer in my study room was nailed manually. 192.168.1.1 After changing the segment of the gateway or router, it will no longer be able to access the Internet. The gateway in ipconfig is still the old value. In this case, temporarily change the network card back to "automatic acquisition (DHCP)", and the gateway will be back - the method to change is in the network adapter properties, click on the IPv4 item, and check back to automatic. By the way, the correct way to fix the IP of the device for a long time is to bind it in the background of the router instead of filling it in manually on the computer. That article Bind a static IP to the device Here I tied up the printer and NAS at home one by one, and the ideas can be moved.

The gateway method fails mostly due to three situations:

If the address you see on the mobile phone gateway still cannot be opened after typing in it, or the gateway column does not display the address of the router at all, don’t panic, check the number and see these three situations.

The first is the most common. If the optical modem works in routing mode, it will also send DHCP itself. If the mobile phone is connected to its WiFi, the gateway it sees will naturally belong to it. The address you see at this time can be opened, but the page is not the backend of the router at first glance - the top is the operator's logo, and the function menu is different from that of the router. Entering the wrong backend and making random changes is the easiest thing for a novice to do. How can you tell whether you have entered an optical modem or a router? Both sides fight over IP There is a special judgment method in that article.

The second one is a little more roundabout. Some old tutorials teach you to turn off the DHCP of the sub-router and use it as a switch. In this connection method, the sub-router does not have any address under its own name to send. If you browse the gateway in the device under it, what you find is the house number of the upper-level route. There is really no way to check the new address of this machine, so we jump directly to the third step.

The third move: The brand App is bound locally and only the machine is recognized without asking for the address.

Now all brand apps have local binding capabilities: Mijia, TP-LINK's IoT, and Mercury's apps, connect your phone to the WiFi from this router (it doesn't matter which segment), open the app to add a device, it can sweep out the machine in the LAN and connect it directly. The entire process does not require you to enter any address.

After binding, you can check the running status, change the WiFi password, and basically perform high-frequency operations related to router management in the App. If you want to find a new address, some brands of apps will directly write out the LAN port IP on the "Router Information" or "Network Settings" page, and you can find it at a glance - this is how my friend's Xiaomi knows the details. If I click on the router card in Mijia, there will be a clear line on the details page. 192.168.6.1 , much faster than I guessed in half a day. If you really can’t find this item in the App, another way is to change the WiFi password once. When changing it, the App will ask you to re-enter the password, and take this opportunity to go through the entire configuration.

The shortcoming of this path is that it cannot cover machines that are too old or too noisy. The app doesn’t recognize the old, white-brand enterprise machine from five years ago. That leaves only the fourth way.

The fourth move: Guess the common segment, there is a high probability of hitting it within 20 minutes

It sounds crude, but the success rate is not low. People who change LAN port IP have similar mentality.: Change the paragraph to one that is different from the original and easier to remember. There are only a few options to choose from, tossing and pulling. I listed the ones that people around me have changed and those that I have seen behind the scenes, sorted by hit rate.:

192.168.2.1 (Most modified, the first choice for Avoid optical modem 1.1), 192.168.0.1 (The default segment of the old Mercury Tengda, someone changed it and forgot that the machine itself is this), 192.168.6.1 and 192.168.3.1 (The picture may be linked to the floor room number), 192.168.31.1 (Copied by Xiaomi by default), 192.168.50.1 (ASUS default segment). If you type each one one by one, the login box will pop up and you will find it. If you use the mobile browser quickly, you can complete one round in 20 minutes.

I have to say something ugly first here.: The gateway is given priority, guessing the segment is not an option. The premise of guessing is that your mobile phone is still connected to the router. Every time you type an address, if the login box does not pop up, immediately change it to the next one. Don't repeatedly refresh and compete on an address that cannot be opened. It is a waste of time. What is the difference between 1.1 and 0.1? Why are the default segments of machines different? I am Comparison of two house numbers I discussed it in detail in that article. After reading it, you will have a clearer understanding of the concept of "section" and you will have more direction in guessing.

If you can't find it after walking all four roads, it's your turn to reset. Press and hold the reset button to restore the factory settings, and the machine will return to 192.168.1.1 , but the price is that the broadband account, WiFi password, and bound smart devices all have to be redone - if you haven’t copied the broadband account, check it out first. Five ways to retrieve your broadband account Let’s start with that article. Don’t get stuck at the dialing step after reset and just stare. How to reconfigure the network after reset? Dial-up again after reset That one has the complete sequence.

ending: After retrieval, plug these three holes

Retrieving it in the background is just to stop the loss, don't lose it next time. The three things I did for my friends cost less than ten minutes in total. You can also copy them.

The first thing is to write a note with the new address and stick it on the router, or take a photo and save it in your mobile phone album. The most effective method is to use the corner of A4 paper to write "Backstage" 192.168.6.1 」It was attached to the inside of the weak current box cover, and it hasn't happened again in half a year. The second thing is that the browser bookmarks are updated. What he has in his old bookmarks is 192.168.1.1 , the bookmark did not move after changing the paragraph, and every time I clicked on it, I had the illusion that "the router is broken." When this illusion accumulates too much, people begin to doubt the machine, and then reset randomly. The third thing is, if you change the network segment to avoid something (such as VPN segment collision), read it first before taking action. Calculate five accounts before changing the network segment , the calculations of "Which paragraph to change and whether it will affect the bound device" are clear. If you remember the modified paragraph, it is worthwhile to change it. As for the question that some people are worried about, "should you restart the machine regularly after changing the network segment?", that has nothing to do with the house number, it is another matter. The intervals and practices depend on it. How to set a scheduled restart That article is enough.

To end with a fair word: The setting of LAN port IP cannot be touched once a year in home scenarios. It is normal to forget about it. Don't be afraid of changing the network segment just because it's troublesome to retrieve it once. Change it boldly when it's time to change it - after all, compared to two machines fighting in the same segment and the whole family being disconnected, the cost of finding the house number once is much smaller. Follow these four paths in order, and always put reset in the bottom of your pocket, and it won't be a big deal.