MTU Path Discovery - Find Maximum Transmission Unit
Discover the optimal MTU size for any network path. Avoid fragmentation, reduce overhead, and optimize network performance with accurate MTU detection.
Understanding This Tool
What It Does
Discover the maximum transmission unit (MTU) size along the network path to a host. MTU discovery finds the largest packet size that can traverse the entire path without fragmentation.
Understanding the Results
- MTU Size: Maximum bytes that can be transmitted in a single packet
- Path MTU: The smallest MTU along the entire route to destination
- Fragmentation Status: Whether packets are being fragmented
- Optimal Settings: Recommended packet size for this path
Common Use Cases
- Network Optimization: Adjust packet sizes for optimal throughput
- VPN Configuration: Set correct MTU for VPN tunnels
- Performance Tuning: Prevent packet fragmentation and retransmission
- Troubleshooting: Diagnose connectivity issues caused by MTU mismatches
- Network Design: Plan network infrastructure with proper MTU sizes
Pro Tips & Best Practices
- Standard MTU: Typical Ethernet MTU is 1500 bytes
- Tunneling Overhead: VPNs and tunnels reduce available MTU
- TCP Window Scaling: Works with MTU discovery for optimization
Last reviewed:
How this tool works: This tool runs in your browser and on our server in real time. Depending on the tool, results are computed directly from the input you provide or retrieved from live, authoritative data sources at the moment you run a lookup. We do not sell your data, and your lookups are kept private — any history shown here is stored only on your device.