🚀 Ubuntu Server MTU Optimizer PRO (v2.2)

A high-precision network optimization tool designed to find and apply the perfect Maximum Transmission Unit (MTU) for your Ubuntu server. Unlike standard MTU scripts, this version prioritizes stability, zero packet loss, and low jitter over theoretical maximums.

✨ Key Features

• Binary Search Discovery: Quickly identifies the exact Path MTU (PMTUD) for your specific network route.
• Stability Stress Test: Runs high-frequency pings (50+ packets) to detect micro-losses and jitter.
• Intelligent Recommendations: Automatically suggests a "safety cushion" if your network shows signs of instability.
• Auto-Apply Logic:
  • Temporary: Apply and test without risk (resets on reboot).
  • Permanent: Automatically writes a custom Netplan configuration (/etc/netplan/99-mtu-optimizer.yaml).
• Ubuntu Native: Full support for Ubuntu 20.04, 22.04, and 24.04.
• Safe Execution: Strict error handling, IP validation, and automatic cleanup on interruption.
• Debug Mode: Set VERBOSE=1 for detailed diagnostic output.

⚡ Quick Start (One-Line Run)

Run this command to start the optimizer immediately as root:

curl -sSL https://raw.githubusercontent.com/LivingG0D/mtu_optimizer/main/mtu_optimizer.sh | sudo bash

🛠️ How it Works

1. Detection: Identifies your active network interface and gateway.
2. Calculation: Uses a binary search algorithm to find the largest unfragmented packet size.
3. Stress Testing: Floods the route with optimized packets to ensure the MTU doesn't cause jitter or drops.
4. Optimization: If jitter or loss is detected, it suggests a slightly lower MTU to ensure a smoother data flow.
5. Application: Gives you the choice to apply the settings temporarily or permanently via Netplan.

📋 Requirements

• Ubuntu Server (20.04+)
• Root/Sudo privileges
• curl installed (sudo apt install curl -y)

⚠️ Safety First

The script includes multiple Safety Verification steps:

• IP Validation: Prevents malformed or invalid IP addresses from being used.
• Connection Testing: Tests MTU changes before making them permanent.
• Automatic Rollback: If connection is lost, reverts to your previous working MTU.
• Cleanup Trap: If interrupted (Ctrl+C), automatically restores original settings.
• Netplan Detection: Checks if Netplan is available before attempting permanent configuration.

🔧 Debug Mode

For troubleshooting, run with verbose output:

curl -sSL https://raw.githubusercontent.com/LivingG0D/mtu_optimizer/main/mtu_optimizer.sh | sudo VERBOSE=1 bash

📝 Changelog

v2.2

• Added strict mode (set -euo pipefail) for safer execution
• Added IP address validation to prevent invalid input
• Replaced Perl regex with POSIX-compatible parsing (works on all systems)
• Added cleanup trap for Ctrl+C handling
• Improved ping output parsing robustness
• Added Netplan availability check
• Added verbose/debug mode (VERBOSE=1)
• Fixed dependency check with correct package names
• All function variables now use local to prevent scope pollution

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Maintained by: LivingG0D