MTU Checker

Test and find the optimal Maximum Transmission Unit (MTU) size for your network connection to prevent packet fragmentation.

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About This Tool

The MTU Checker is a comprehensive network diagnostic tool that helps you determine the optimal Maximum Transmission Unit size for your internet connection. MTU is the largest data packet that can be transmitted over a network without fragmentation. Using this tool, you can test MTU for any IP address or domain name by sending ping packets with varying sizes, or analyze pcap files to detect fragmentation issues. The tool provides detailed results including the maximum unfragmented packet size, recommended MTU settings, and fragmentation analysis to optimize your network performance.

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How to Use

Enter a target IP address or domain name in the input field
Optionally specify a custom MTU value to test (default is
Alternatively, upload a pcap file for MTU analysis
Click the 'Check MTU' button to run the test
View detailed results including optimal MTU size, fragmentation status, and recommendations
Use the 'Test Again' button to perform additional checks

Frequently Asked Questions

Find Quick Answers

What is MTU and why is it important?

MTU (Maximum Transmission Unit) is the largest size of a data packet that can be transmitted over a network without fragmentation. Proper MTU settings prevent packet fragmentation, which can cause performance issues, increased latency, and connection problems in VPNs, gaming, and streaming.

How does the MTU Checker work?

The tool sends ICMP ping packets with varying sizes to the target, using the 'don't fragment' flag. It identifies the largest packet size that successfully reaches the destination without fragmentation, then calculates the optimal MTU by adding 28 bytes for IP and ICMP headers.

What is a typical MTU value?

For Ethernet networks, the standard MTU is 1500 bytes. For PPPoE connections (common with DSL), it's typically 1492 bytes. VPN connections often require lower MTU values (around 1400-1420) to accommodate encapsulation headers.

Can I use this tool without technical knowledge?

Yes! Simply enter a website address (like google.com) and click 'Check MTU'. The tool will automatically determine the optimal MTU size and provide clear recommendations in plain language.

Need to run multiple calculations?

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