How to fix IP for Mercury Tenda router? The printer cannot be found after restarting. Please check in the background.

My Epson L3255 printer, connected to the Mercury D191G, has been used for more than half a year, and something goes wrong every now and then.: When I press Print on the computer, the queue waits for a long time, and finally a "Printer Offline" message pops up. When I went to check the printer, the WiFi light was on and I could see it in the router, but the computer couldn't find it.

Later, I discovered a pattern. As long as the router is restarted in the middle of the night, or there is a power outage at home, the printer's IP will change. today is 192.168.0.102 , it may jump to 105 tomorrow. The printer port stored in the computer still has the old address, and of course it is offline. Only by fixing the device IP can the problem be solved from the root.

Don’t fill in the fixed IP on the printer first. The correct way is to bind it to the router.

When it comes to fixed IP, many people's first reaction is to go into the printer settings and fill it in manually. 192.168.0.200 , subnet mask 255.255.255.0 , gateway 192.168.0.1 . I've done this before, and the problem happened again within two days.

The reason is not complicated: The DHCP on the router's end is still automatically sending addresses. It doesn't know that the printer has occupied 200. There was a time when the distribution order was messed up and 200 was sent to the mobile phone or TV box. When the two ends collided, the printer went offline again. The static IP set by the device itself and the one assigned automatically by the router are two sets of accounts that are inseparable from each other.

The correct approach is Only do static address allocation in the router , clients such as printers, NAS, and cameras keep "obtain IP automatically", and leave the rest to the router to identify the device according to its MAC address. You tell the router: See the MAC of this printer and send it forever 192.168.0.200 . Don't fill in a static IP on the device unless you also turn off the router's DHCP, but for home use there is really no need to force yourself down that road.

By the way, to clarify the concept, the static allocation here is not equal to the static IP in the Internet access method. Whether your home broadband uses PPPoE or dynamic IP depends on the WAN port. ； Fixing the intranet IP for the printer is a matter of the LAN port. I've messed around with these two before, and I almost cut off my broadband when I made the wrong mistake. The article about how to access the Internet I specifically talked about how to choose between the three options.

Mercury D191G: Scroll through the advanced settings, and the entrance is called IP and MAC binding.

Let me start with the Mercury D191G I have. Connect your phone to WiFi, and click on the browser melogin.cn , knock if you can’t get in. 192.168.0.1 . If you are stuck at this step in backend login, don’t waste time on this article yet. Troubleshooting sequence for failure to enter Mercury Tengda backend I wrote about it individually.

After entering, there is "Advanced Settings" in the upper right corner of the D191G generation page. Click on it and then look for "Network Parameters". At the bottom is "IP and MAC Binding". The first time I looked for "DHCP Server" according to the old tutorial on the Internet, I browsed for three minutes and didn't see it. I thought the firmware had been deleted. In fact, the new interface merged the names.

If you have an older Mercury, such as the MW310R, the path will still be the same.: Under "DHCP Server" on the left, first look at the "Client List", copy down the MAC of the device to be bound, then enter "Static Address Allocation", click "Add New Entry", fill in the MAC and IP, select "Effective" for the status, and save. The two sets of interfaces look different, but they do the same thing.

When I fixed the printer, I first wrote down its IP and MAC from the client list. The MAC of a printer does not change randomly like a mobile phone. It is basically enough to copy it once and fill it in later. What is really easy to change is the mobile phone, which will be discussed separately later.

Mercury has a detail here: It's called "IP and MAC binding", not "static address allocation". When filling in the MAC, don't copy it from the random address in the WiFi settings of your phone. Apple calls it a "private WiFi address" and Android calls it a "random MAC." If you don't turn it off, it will be a temporary address. I will talk about this pitfall separately below.

Tenda AC10: Find the static allocation in the DHCP server, and the new firmware has a different name.

I helped my cousin get an AC10 from Tengda. His AC10 was often jammed with customers’ mobile phones and the address jumped randomly. The smart camera at home went off every two days. The path is different from that of Mercury, and I didn’t find it right the first time I went there.

The common entrance to the old AC10 is "Advanced Settings" on the left. Click on it and look for "DHCP Server". Once there, you can see "Client List" and "Static Allocation". Select the online device, tick the one you want to fix, fill in an IP, and save. The advantage is that you can choose directly from the online device list without having to copy the MAC first. ； The disadvantage is that the list in some firmware does not display the complete MAC, so you have to enter the device details and then copy it.

The newer Tenda firmware has changed this name. For example, on the W18E page, the path will become "More Functions → Network Settings → LAN Settings", and look for DHCP static allocation there. The name changes from "static allocation" to "IP static IP allocation", which is quite confusing, but as long as you remember the key words are DHCP , basically you won’t find it lost.

Don’t mess with “Internet Speed ​​Control”. You can also see online devices on the Internet speed control page, and you can also kick people and limit the speed, but that is a bandwidth limit, not a fixed IP. I used to write The article about Tenda speed limit As mentioned at the time, I have set up two sets of backends. The entrances look similar but have different functions.

Of the four pitfalls I've stepped into, the first one was a waste of half an hour.

The first is Mobile phone random MAC . It's actually okay to bind it to the printer. The printer MAC usually doesn't change. But if you want to fix the IP for your mobile phone or tablet, once Apple's "Private WiFi Address" and Android's "Random MAC" are turned on, the one copied today and the one connected tomorrow will not be the same MAC at all. Before binding, go to the mobile phone WiFi details to turn off this option, and then copy it.

The second is IP falls into address pool . The DHCP address pools of Mercury and Tenda often start from 192.168.0.100 Start sending and send all the way 192.168.0.199 Even 254. You fix it 192.168.0.101 , looks correct, but this address may be snatched away by other devices at any time. My habit is to use a fixed IP 192.168.0.50 to 99 , or simply after 200, go back and tighten the starting point of the address pool so that it does not overlap.

The third is It’s bundled in the router, so I fill it out manually on the device. . If 200 is manually set on the printer side, 200 is also written in the static allocation of the router. After restarting, the printer's own 200 will take over first, and subsequent transmission from the router may conflict. Choose one of the two, in the home environment, keep the binding in the router, and change all devices to obtain it automatically.

The fourth is If I don’t restart after tying, I think it didn’t take effect. . When you first save it, the printer still holds the old IP and will not switch to the new address immediately. The most stable thing is to restart the router, or go to the client list to kick the device offline and let the printer reconnect. Wait a minute or two and come back to see if the IP is still the one you wrote, which is considered a success.

How to verify after tying? If you can’t connect, follow these three steps to get it.

Fixed IP is not something you click and save. I ordered three viewings for myself: First check the router client list to see if the printer’s IP has changed to the one you filled in. ； Check to see if the computer can print normally. ； Finally, restart the router and confirm that the IP remains unchanged. Only when you pass these three things can you be considered truly fixed.

If the device cannot be connected after tying it, please arrange in the following order::

• First check whether the MAC is copied correctly. The letters B and 8, the number 0 and the letter O are the most likely to be copied incorrectly.
• Check again to see if the IP fell into the address pool or collided with other devices. Try changing to an address outside the pool.
• Finally, look at the random MAC of the mobile phone and the manual static IP of the printer, and turn them off or change them back to automatic acquisition.

After I fixed the printer for the first time, printing was successful, but the port forwarding of Synology at home suddenly couldn't find the NAS. Looking back, I discovered that the NAS still obtained it automatically. It changed the IP last time it was restarted, and the port forwarding was set in vain. Later, I simply tied the NAS, printer, and camera together, locked all the addresses, and no more problems occurred with port forwarding and computer printing. I also follow this general logic 192.168.1.1 Static IP binding article As discussed here, Mercury Tengda is essentially the same, except that the backstage name has been reskinned.

I really need to understand the terms DHCP, address pool and lease thoroughly. Router DHCP article It’s also worth reading. I wrote in detail about my experience of turning off DHCP with my hand and shutting down the whole house. You only need to remember one thing here: Fixed IP addresses for home devices, and send them to the router based on MAC address. Don’t make your own decisions on the devices.