Packet Transmitted Size (MTU) Mismatch

What is MTU-MISMATCH?

The MTU-MISMATCH error is categorized as a medium-severity network adapter issue that can significantly impact your PC's stability. Different Maximum Transmission Unit settings cause fragmentation and brutal network slowdown. When experiencing the Packet Transmitted Size (MTU) Mismatch fault, users often report sudden system crashes, unresponsive behavior, or a blue screen of death (BSOD). In most diagnostic scenarios, this problem is directly triggered by underlying hardware or software complications such as isp provider error, corrupt network card driver, stuck router and ip address conflict. To permanently resolve the MTU-MISMATCH issue and prevent further system degradation, it is highly recommended to follow our step-by-step troubleshooting guide below, ensuring your network adapter components are functioning correctly.

Common Causes

• ISP Provider Error
• Corrupt network card driver
• Stuck Router
• IP address conflict

Step-by-Step Fix Guide

• 1
  Restart the router (turn off for 1 minute)

  Applying the first fix (Restart the router (turn off for 1 minute)) addresses the most common root cause of MTU-MISMATCH and restores baseline functionality.

• 2
  Reset complete network settings in Windows

  If the problem persists, proceeding with the remaining steps ensures all edge cases related to network instability are covered.

• 3
  Change the DNS servers to 8.8.8.8

Commands & Diagnostics