How do you limit the speed of a device on a Mercury router? My home internet speed keeps getting stolen, so I entered 192.168.0.1 and fixed all three devices perfectly
incident started when the family member installed a live streaming app. As soon as the TV box started broadcasting, the whole family's network felt like it was being choked: I made video calls and the screen was blurred like mosaics, and the kids spun in circles during online classes. 300 Mbps broadband is consumed by a single box. At first, I wanted to switch routers, but then I figured it was wrong—it wasn't bandwidth shortage, but no one managing the order. The Mercury D191G at home already has a speed limit function in the background, so I dug it out and set it up. That night, the world was completely quiet. This article clearly explains the entire operation and pitfalls.
to get straight to the point: speed limit isn't about cutting the other person's internet speed to the point of use, but about setting a cap so they can't grab your no matter how hard they try. Once you figure this out, you'll be able to calculate every number after that. Where is the
entry point: Device management hides a speed limit button
connect your phone or computer to Mercury's WiFi, enter 192.168.0.1__html13__ in the browser's address bar, enter the management password to enter the backend. Pay attention to two things: first, if you enter the address bar, not the search box, entering the wrong location will cause search engines to take you. I explained this pitfall in detail in melogin.cn previous article; Second, managing passwords and WiFi passwords are two different things. If you forget, check the post where I wrote the initial password before—the new and old models have different ways to recover them. After
the backend, find the "Device Management" menu. Some firmware versions call it "Host Status" or "Connected Devices." Clicking in shows a list of online devices, each with a row: name, MAC address, real-time speed, and several small buttons on the far right. The speed limit button is usually an icon (the kind with a downward arrow plus a number). Clicking it will pop up a settings box with two input boxes: downlink rate and uplink speed .
internal link reference: Complete troubleshooting of entry points that won't open. I wrote an article on five situations where melogin.cn and 192.168.0.1 can't be opened, forgot to check the on the Mercury initial password for management passwords.
recognizing the equipment is the first step, don't limit yourself blindly. My homemade remedy: have family members take turns disconnecting from WiFi, and whoever disappears from the list becomes the one with the number on each device. Some of the names displayed in the list are garbled English letters—those are device hostnames. If they don't match, check the MAC address in your TV box's settings page. Matching the last six digits locks the device. How to fill in
numbers: Calculate the upper and lower rows separately, don't copy my
This is the most confusing part for beginners. Let me show you the calculation. If your broadband is 300 Mbps, the download limit is about 37MB/s—but the speed limit box usually lists Kbps or Mbps. 20 is 20 bits per second, which is about 2.5MB/s for an actual download speed . Limiting the TV box to 20MB is more than enough for HD live streaming (usually 8-15MB is enough), but it can no longer use your 300MB.
upstream, many people don't care, but this is actually the real culprit behind video call cards. Home broadband uplink is generally only 30-50 Mbps, and live streaming apps are very competitive to push upstream. I set a 5MB uplink limit for the box, and my video call uplink stabilized immediately. Here's a reference value table for you:
| equipment | recommended downlink speed limits | uplink speed limit recommendations—what are they enough for | |
| TV Box/Live Stream | 20 | 5 Megapixel | HD live streaming is smooth and doesn't compete with the main network |
| 50 | 10 megapixels on your child's tablet | online courses + SD videos is sufficient | |
| download dedicated device | 100 mega | 20 | hang on and download slowly, no problem during the day |
| guest devices | 30 megabytes | 10 megabytes | streaming videos smoothly and large files are |
There's a pitfall when filling it out: some firmware versions can only enter a minimum of 1024Kbps for downlink. If you enter 500, it won't get an error but won't save, so you have to use trillions as the unit to refill it. After saving, you don't need to restart the router—it takes effect immediately, and any restricted devices don't need to be disconnected.
restrictions not working? I checked these three reasons one by one
and immediately fell into the first pitfall: I filled in the numbers and saved, and the box was still enjoyable. Later, I found out it was dual-band integration messing up—my home had 2.4G and 5G combined into one WiFi name. Last time the box was connected to 2.4G, and I limited the list to its 5G records, which basically meant limiting it to nothing. Restrict entries with the same name from both frequency bands once to truly take effect. If you have dual-band integration at home, the same device may show up two items on the list, recognize MAC addresses, and set them all up.
first confirm that the number of devices is not exceeded: Mercury and other home devices have a limit on the number of devices they can carry with devices. Once you have many devices, disconnections and lag naturally occur, which has nothing to do with speed limits. I once wrote a checking the number of devices (Xiaomi's model, the idea is similar). Let's rule out this first before discussing speed limits.
second reason is that restricted the wrong article . After the device is powered off and reconnected, the MAC remains unchanged, but some devices (mainly Android phones) enable random MAC and change the address each time they connect to WiFi. The MAC you restricted is long gone. If you encounter a limit but no response, first check if the MAC currently used by this device in the list matches the one you are restricting. If not, either turn off the device's random MAC or limit both the new and old MACs.
third reason is that router speed limiters cannot manage the application layer . The speed limit is the device's total bandwidth. If the other party uses multithreaded downloads, it still fills up the quota—but that's enough. They use their own 20MB, while yours 280MB is secure. Don't expect speed limiting to refine the controller "games only, not web pages"—Mercury's features at this price point can't be that detailed.
two tricks even more ruthless than speed limits: banning and blocking
Speed limits give you face, banning means physical violence. The button in the device list includes not only speed limits but also "disabled." Clicking it immediately kicks the device off the internet and can't connect. It's perfect for dealing with kids sneaking around at night—disable at 10 PM, undo at 7 AM, and be more civilized than unplugging the cable. Disabled devices will be added to the blacklist; if you want to add them, you can manually remove them.
if you find a completely unfamiliar device in the list, it's not about speed limits—it's someone trying to freeload your Wi-Fi. Change your WiFi password quickly. How to catch anti-scraping nets and how to use the three-layer protection—I've previously written a specifically about anti-scraping nets, so I won't repeat it here. By the way, giving WiFi to guests is a more elegant solution than speed limits: the visitor's network so the main network password doesn't need to go out, and the guest's internet speed can be individually restricted—killing two birds with one stone.
don't use speed limits
To be honest, not every lag should be fixed by speed limits. If your home only has 100Mbps broadband and everyone has a phone and a TV box, the bandwidth is really insufficient. Limiting it to anyone is useless. You should upgrade your broadband. Scenarios suitable for speed limiting are: total bandwidth is sufficient, but some devices are unruly.
there's another trick: go to the backend device list and check the real-time speed column. Whoever dominates the rankings for a long time is the suspect. When my box started streaming, it showed over 180 trillion downloads, solid evidence. If there are no obvious major players and everyone's speeds are average but overall lag, the problem is mostly channel interference or elsewhere. Speed limiting can't fix it, so you need to look another way to find out who's competing for bandwidth .
I've been setting up this speed limit for over three months now, and my family hasn't lost face over the bandwidth again. The cost of the whole operation was a ten-minute backend operation, and the profit was that video calls never got lost again. If you have any of the three types at home—a live streaming box, a downloader, or someone sneaking around late at night—it's worth spending ten minutes setting this setting.
