TopicIT Networking →
Simple definition
The maximum size of a package that can be transmitted on a link without fragmentation.
Technical definition
Maximum Transmission Unit sets the maximum load size of an IP package on an interface. Ethernet commonly uses a MTU 1500 bytes.
What is it used for ?
Avoid fragmentation and diagnose some problems of VPN or navigational.
Practical example
A tunnel VPN adds headers; a MTU too high can cause sites that partially load.
Common issues
- MTU too high in a tunnel
- Path MTU symbolized
- Fragmentation or loss of packages
Related terms
Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.