Modern mobile operators, including Fly, technical restrictions are increasingly being introduced on internet sharing from SIM cards intended for modems and routers. Users are faced with a situation where their tariff plan provides unlimited data usage, but when attempting to share Wi-Fi with other devices, the speed drops to zero or the connection is completely lost. This occurs due to the operator's analysis of the parameter TTL (Time To Live), which indicates the type of device sending the request.
You don't have to put up with artificial barriers if you own the equipment. Huawei or ZTE, operating on 4G/LTE networks. There's a proven algorithm that allows you to hide the fact that you're distributing traffic from your provider's servers. In this article, we'll detail how to configure your router or modem to bypass blocking and restore high connection speeds for all your devices.
It's important to understand that bypass methods are based on changing the default network settings of equipment. This doesn't compromise the integrity of the operator's network, but merely adjusts the data packet headers, making them indistinguishable from regular smartphone or tablet traffic. Let's look at the technical details of this process and prepare for setup.
How does provider-side distribution blocking work?
Mobile operator Fly detects internet distribution by analyzing data packets passing through the gateway. Each device accessing the network has its own unique packet lifetime identifier— TTL. The default value for the operating system Windows usually is 64 or 128, for Android - 64, and for iOS — 255. When you connect your laptop to the router, the TTL value in the packets changes, and the operator's monitoring system sees this change.
As soon as a spike or change in the characteristic TTL value is detected, the automatic blocking system activates speed limiting or completely halts data transfer. This is why "modem" plans are often more expensive or have hidden limits. Bypassing this mechanism requires setting the TTL value on the router to match the reference value the operator considers "normal" for a single device.
⚠️ Please note: Operator policies are subject to change. In some regions, blocking may be based not only on TTL but also on DNS query analysis or User-Agent. If changing the TTL doesn't help, your region may have stricter filters.
It's important to note that changing the TTL isn't hacking in the classic sense, but rather reconfiguring the network stack settings of your equipment. However, using such methods may formally violate the terms of the offer agreement, so you decide whether to implement these settings yourself.
Necessary tools and equipment preparation
Before you begin modifying the settings, you need to make sure your equipment supports the required functionality. Most modern modems Huawei (series E3372, E8372, E5577) and routers ZTE (MF833, MF920) allow you to change the TTL via a hidden menu or special buttons. You'll need a computer with internet access (to download the software) and the modem or router itself.
For a smooth experience, we recommend using a wired connection between the modem and your PC via USB during setup. This will eliminate the risk of losing the connection while making changes. Also, make sure the modem has a SIM card installed from your carrier. Fly and it is active, that is, it is able to accept incoming connections, even if the Internet on it is limited.
☑️ Preparing to set up your modem
In some cases, the modem's standard web interface may not have a TTL entry field. In this case, you will need to access the management console via adb or using specialized utilities such as Huawei TTL Changer or scripts for OpenWRTIf the router has been reflashed, basic preparation includes resetting the modem to factory settings to avoid conflicts with old configurations.
Changing TTL via the router's web interface
The easiest and safest way to remove the sharing limit is to find the corresponding option in the hidden menu of your device. Many firmware versions Huawei And ZTE have hidden settings pages that aren't visible in the standard menu. To access them, you need to enter a special URL in the browser's address bar, for example, http://192.168.8.1/html/ttl_set.html or http://192.168.1.1/html/wan_apn_set.html.
If the default addresses don't work, try accessing the console via telnet or ssh, if these protocols are enabled in your firmware version. In the window that opens, you'll see a field TTL, where the default value can be 64 or 0. You need to change it to 65 (for Android) or 129 (for Windows) to compensate for the decrease by 1 when passing through the router.
After entering the new value, be sure to click the "Save" or "Apply" button, and then reboot the modem with the command reboot or via the power button. Without a reboot, changes to the network stack will not take effect, and the restriction from Flying will continue to operate.
List of hidden URLs for different models
For Huawei E3372: http://192.168.8.1/html/ttl_set.html|For ZTE MF833: http://192.168.0.1/goform/setTTL|Universal method: using AT commands via terminal
Please note that interfaces may differ depending on the firmware version. If you don't find the field you need, your carrier may have blocked access to these settings at the firmware level. In this case, a more in-depth reconfiguration via the command line will be required.
Configuration via AT commands and terminal
If the graphical interface does not produce results, help comes AT commandsThis is a direct way to communicate with the modem. To use it, you'll need a terminal program, such as Putty (Serial mode) or specialized software DC-Unlocker. Connect the modem to modem mode (not CD-ROM), find the COM port corresponding to your device in the device manager (usually it is Huawei Mobile Connect - 3G PCUI Interface).
Open a terminal, select the appropriate COM port and baud rate (usually 115200 or 9600). Enter the following command to check the current status: AT^CURC?To set the TTL, use a command like this AT+CGDCONT=1,"IP","internet.letai",-1,0,0,0,0,0,0,0,0,0,0,65, where the last number is the required TTL. The syntax may vary depending on the model.
AT^SYSCFGEX="00",3FFFFFFF,2,4,7000000000000,,AT^SYSCFG=2,2,3FFFFFFF,1,2
AT+CGDCONT=1,"IP","internet.letai"
AT^NDISDUP=1,1,"internet.letai"
After entering the commands, the modem may reboot automatically. If this does not happen, reboot manually. Successful application of the commands is confirmed by stable internet operation on connected devices without any speed drop. Please note that the command AT+CGDCONT requires an exact indication of the access point (APN), which for Flying most often equal internet.letai or letai.
Alternative methods: flashing and OpenWRT
For advanced users who own routers based on OpenWRT or Keenetic With USB modem support, there is a more flexible method. You can customize the rule iptables On the router itself, which will forcefully change the TTL of all passing packets. This is the most reliable method, as it operates at the router's operating system kernel level.
To implement this method, you need to log into the router console (via SSH) and run the command: iptables -t mangle -A POSTROUTING -o usb0 -j TTL --ttl-set 65. Here usb0 — This is the interface through which the modem is connected. This method is universal and doesn't depend on the vagaries of the modem's firmware.
\n
| Method | Complexity | Efficiency | Risk of reset |
|---|---|---|---|
| Web interface | Low | Average | High |
| AT commands | Average | High | Average |
| OpenWRT (iptables) | High | Maximum | Short |
| Change IMEI | High | Low | Critical |
There's also a method for changing the modem's IMEI to the smartphone's value, but this is legally controversial and can lead to the device being completely blocked by the carrier. We strongly advise against IMEI cloning, as it may violate the laws of your country.
Diagnosing problems and checking the result
After making all the changes, you need to verify that the restriction has actually been removed. The first sign of success will be the appearance of the icon 4G or LTE instead of H+ or 3G on the modem indicator if the speed was previously artificially reduced. However, visual indicators may not be enough.
For an accurate diagnosis, connect a laptop or phone to the router and run a speed test on the resource SpeedtestIf you're getting a speed that matches your plan (e.g., 20-40 Mbps or higher), the bypass was successful. If the speed remains low (64-128 Kbps), the blocking is still active.
If this fails, try increasing or decreasing the TTL value by one (for example, change 65 to 64 or 66). Sometimes operators use non-standard values for detection. Also, check if the access point (APN) settings have been reset after a reboot.
Common mistakes and how to fix them
One of the common mistakes is choosing the wrong interface during setup. iptables or entering AT commands. If you specify an incorrect port or interface name, the command will simply fail, and the modem will operate in restricted mode. Always double-check the interface names in the console.
Another problem is resetting the settings when updating the modem firmware. Operator Fly A push configuration update may be performed on the modem, which will reset all settings to their original values. To avoid this, after successful setup, it is recommended to disable automatic firmware updates in the device's web interface.
⚠️ Note: If after all these steps the internet only works on one device but is blocked when connecting to a second one, then detection is not based solely on TTL. Try changing the MAC address of the connecting device or using a VPN on the client.
Keep in mind that connection quality also depends on signal strength. If you're in an area with poor reception, even a properly configured TTL modem won't prevent slow speeds. In such cases, it makes sense to use an external antenna for your modem.
FAQ: Frequently Asked Questions
Can the operator Fly Block SIM card for using data sharing?
In theory, the operator has the right to restrict network access if the contract terms are violated. However, in practice, most often they simply limit the speed (throttling) until you pay for the data sharing option or change the settings. Blocking the SIM card itself is rare.
Do I need to change the settings every time I reboot my router?
If you changed the TTL via the web interface or correctly recorded AT commands in the connection profile (command AT+CGDCONT), the settings should be saved in the modem's memory and applied automatically after each reboot. If the settings are lost, the modem may be receiving an updated configuration from the operator.
Does this method work on smartphone plans?
Yes, changing the TTL is a universal method. However, smartphone plans often have a separate data limit for uploading (e.g., 3-5 GB), after which the speed is throttled. Changing the TTL allows you to hide the fact that you're uploading, and the data will be used from the main unlimited pool, if this is technically possible with your firmware version.
Why did the Internet disappear completely after setup?
This may happen if you entered an incorrect TTL value or an incorrect access point name (APN). Try resetting the settings to factory defaults (using the Reset button on the modem) and repeating the procedure, carefully checking the command syntax. Also, make sure there are sufficient funds in your account.