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How to set the mtu of the router

2025-11-12 03:06:28 science and technology

How to set the MTU of the router

Among the hot topics on the Internet in the past 10 days, network equipment optimization, especially router settings, has become one of the focuses of users' attention. Among them,MTU (Maximum Transmission Unit, maximum transmission unit)settings are critical to network performance and stability. This article will analyze the role, setting method and common problems of MTU in detail, and provide structured data for reference.

1. What is MTU?

How to set the mtu of the router

MTU is the maximum size of data packets in network transmission, in bytes. Different network environments and devices have different requirements for MTU. Improper settings may lead to network delays, packet loss, or even inability to connect. The following are the default MTU values for common networks:

Network typeDefault MTU value (bytes)
Ethernet1500
PPPoE (ADSL dial-up)1492
VPN tunnel1400-1460

2. How to set the MTU of the router?

The following are general steps (specific operations vary by router brand):

1. Log in to the router management interface (usually enter 192.168.1.1 or 192.168.0.1 through the browser).

2. find"Network Settings"or"WAN Settings"options.

3. Enter an appropriate value in the MTU field (refer to the default value in the table above).

4. Save the settings and restart the router.

3. Common problems of improper MTU setting

Problem phenomenonPossible reasonssolution
The webpage is not fully loadedMTU value is too largeGradually reduce the MTU (such as reducing it by 10 each time)
High game latencyMTU doesn't match ISPContact your ISP for recommendations
VPN connection failedMTU exceeds tunnel limitSet to 1400-1460

4. How to test the best MTU value?

This can be tested manually by:

1. Use Windows command prompt to execute:ping -f -l [packet size] [destination IP](such as ping -f -l 1472 8.8.8.8).

2. If it is displayed"Need to split packets but set DF", then gradually reduce the packet size until the ping can pass.

3. Final MTU value = packet size + 28 (IP/ICMP header overhead).

5. MTU setting paths of routers of different brands

BrandSet path
TP-LinkNetwork parameters→WAN port settings
HuaweiAdvanced Settings→Network→Internet Protocol
XiaomiCommon settings→Internet settings→Advanced settings

6. Precautions

1. Before modifying the MTU, it is recommended to record the original value for recovery.

2. Some ISPs (such as fiber optic broadband) may impose mandatory MTU restrictions, and you must follow their requirements first.

3. If home users have no special needs, it is recommended to keep the default value of 1500.

By properly setting the MTU, network efficiency can be significantly improved. If you encounter complex problems, it is recommended to consult your network service provider or professional technicians.

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