Set up DNS on Tenda router, fill in the same address in both boxes, and it will bounce back after saving.

I just went to play with my colleague Xiaolin’s Tenda AX12 last month. Remove dual band That trip was to the web backend. He sent another message at 11 o'clock two nights ago: None of the apps on the TV can be opened, and even if I want to install a new one, I can’t. ； I can send text on WeChat on my mobile phone, and all web pages can be rotated. I asked him not to touch the router yet, and gave him a command, and within ten seconds the problem was found in DNS. This time, I easily recorded all the ways and pitfalls of Tenda changing DNS.

First confirm whether it is the fault of DNS. Don’t change it immediately.

I can send messages via WeChat but cannot open web pages. This combination is most likely caused by DNS. The reason is not complicated: After logging in to WeChat, you use a long connection, and the address has already been parsed and cached. ； Every time you enter a new URL on the web page, you have to ask the DNS server first. The person asking for directions is on strike, and the page naturally keeps spinning.

To verify, press Win+R on your computer and type cmd Press Enter and enter:

nslookup www.baidu.com

Look at the two lines returned. The first line is "Server", which shows who is answering for you. Normally it should be the router's address or the operator's DNS. ； If "request timeout" pops up directly below this line or the resolved address is obviously wrong, the DNS line will not run. Xiao Lin's station couldn't even resolve the Baidu domain name at that time, so no one answered me when I asked.

There is no WeChat on TV for comparison, and the symptoms look different. The trick I taught Xiaolin is: You can open the built-in app store, click on the video and start spinning, and 80% of it is DNS. ； If even the store has a blank screen, that means the entire network is down, which is two different things.

By the way, if WeChat cannot be sent and even the IP cannot be pinged, it is not a DNS problem. Check the line and optical modem first, and don’t waste time on DNS. There is only one formula for judgment: Partially accessible and partially unavailable, suspect DNS first. ； All disconnection, first suspect the line .

For the DNS entrance of the new interface, scroll down in the Internet settings.

To be honest, the DNS entrance of Tenda's new firmware (AX12 and AX3 batches) is not hidden, but it is easy to find it in the wrong place the first time. Browser input tendawifi.com or 192.168.0.1 , enter the management password. Be careful not to confuse it with the WiFi password. If you can’t tell the difference, read what I wrote. Tenda initial password article . I can’t even enter the backend. Two of the most common mistakes are that the phone is connected to a neighbor’s WiFi with the same name, and the address is entered into the search box and is used as a keyword. I’m here. 0.1 Can’t open that article I went through them one by one and spent two minutes arranging them before going down.

After entering, click "Internet Settings". Yes, it is the page where you set up your broadband account and select the WAN method. IPv6 was written before Also operate on this page. The DNS box is placed on the same page. Scroll down and the "DNS Settings" section will be automatically checked by default. Click the button to manually display the "Preferred DNS" and "Backup DNS" boxes below.

The first time I went through it was in the "Network Parameters" - that was the way of the old AC series, and there was no such menu in the new interface. After helping Xiao Lin make the changes, I went around in the Tenda WiFi App. I rummaged through the toolbox and couldn’t find the entrance to DNS. This job is the same as Mercury and Xiaomi. Mercury Edition and Xiaomi version They are all exclusive to the web backend. If you want to change DNS remotely on your mobile phone, you should stop thinking about it as soon as possible.

Another entrance to the old AC series, the two generations of interfaces are facing each other

If you have old machines of the AC10 or AC9 generation at home, the menu names will be completely different. After logging in, find "Network Parameters", click "WAN Port Settings", scroll down the page, there is an option to manually set the DNS server, uncheck the automatically obtained box, and the preferred backup box will appear.

If you're afraid that you can't find it yourself, there's a stupid way to save trouble.: After entering, click on the menu on the left one by one. Wherever the three letters "DNS" appear on the page, it will be that. It does not take more than two minutes.

The first choice and backup cannot be filled in the same way. I only found out after being bounced.

The real pitfall is here. Xiao Lin was quick and filled in both boxes. 223.5.5.5 ——Thinking that it is Alibaba DNS anyway, double insurance. Click Save, and a line of prompts will pop up directly on the page.: The preferred DNS and backup DNS cannot be the same , the configuration is not saved at all.

This is a hard-coded verification on the Tenda interface. I later encountered the same blocking method on the old AC10. Logically speaking, the backup DNS is used to take over when the first choice fails. Filling in the same two names means there is no spare tire. Tenda simply won't let you save it. So you have to fill in both boxes:

overseas 8.8.8.8 I advise you to save your money. In China, the latency is high and packets are lost from time to time. Although the parsing can be done, the web page will be opened even slower. I have previously posted the actual measurement of each company’s delay figures in the Mercury article. If you want to understand the principles of DNS, please read the general version. , which will not be repeated here.

Don't use the spare frame as a decoration. Less than a week after the change was completed, Xiaolin's preferred DNS server had a seizure one night, and the entire house's web pages were turned around again - this time the backup was on, and WeChat and most websites were still available. He found out when he looked at the background logs the next day. If the first choice and backup are filled in the same way, it will be back to the original shape on the spot that night. Filling in two boxes with two families is the purpose.

The modification will not take effect. Please deal with the three situations one by one.

After filling in and saving, don’t rush to declare victory yet. When Tenda changes DNS in broadband dial-up (PPPoE) mode, you have to disconnect and redial once before it can actually switch over. You can also restart the router in the background and wait for a minute or two.

Then there's the device cache. Win+R on the computer cmd ,lose ipconfig /flushdns Press Enter to clear the cache ； Just turn off the WiFi on your phone and reconnect it. Xiaolin's TV app finally recovered after powering off for 30 seconds and then restarting it. The cache of smart devices is worse than that of mobile phones.

The third type is the most hidden: IPv6 is on the wrong track. Nowadays, mobile phones and TVs give priority to IPv6 DNS. If only the IPv4 part is changed on the router, the device may not have the address you filled in at all. The verification method is still nslookup to see if the returned responder is correct. In addition, it is also true that the operator rushes to answer everything you fill in. When you query plain text UDP 53, someone intercepts you and answers it for you. I wrote about verification and response in optical modem’s article , the router side cannot cure this.

After making the changes, I want to confirm whether they have taken effect or not. Don’t just rely on your feelings. Just type it again. nslookup www.baidu.com , see if the name on the answering end has changed. Previously, the responder displayed the operator's DNS name. After changing it, the displayed name should be the router or the one you newly filled in. The Xiaolin family relied on this for confirmation that night. They checked it twice before and after, and the words in black and white were more reliable than anything else. This problem of "only remembering that DNS exists when it is broken", Mercury’s article on troubleshooting melogin that cannot be opened I also bumped into it once, and the final stuck point was also DNS.

In both cases, it is useless to make changes. Think clearly before making changes.

The first type: The router is used as an AP. My cousin's Tenda AC10 is hung under the main router and used as an AP. The LAN port IPs were all swapped at the beginning. . When the AP machine is not responsible for dialing or sending addresses, the DNS is managed by the main router, and changing it on AC10 is a waste of time. The person who dialed the number will go to the home to change it. Remember this sentence to avoid detours.

The second kind: Want to speed up by changing DNS. DNS only cares about the step of "translating the URL into IP". The translation speed affects the first time you open the web page. It does not care about the download speed or video resolution. It was 300MB before the change, but it is still 300MB after the change. It cures only two diseases: Certain websites cannot be opened, and DNS may be hijacked and ads may appear.

Give an order at the end: First, nslookup confirms that it is a DNS problem → proceed tendawifi.com Find the Internet settings (for older models, use network parameters) → fill in the two different ones for the first choice and backup → save and then restart or redial → flushdns on the computer and reconnect on the mobile phone → still can’t check IPv6 and operator response. It took 20 minutes for Xiaolin's family to find the problem that night and restore the web page. The longest stuck moment was when two boxes were filled in the same way and they bounced back.