Maximum Transmission Unit

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Maximum Transmission Unit

(MTU) The largest number of bytes of "payload" data a frame can carry, not counting the frame's header and trailer.

A frame is a single unit of transportation on the data link layer. It consists of header data plus data which was passed down from the network layer (e.g. an IP datagram) plus sometimes trailer data.

An Ethernet (V2) frame has a MTU of 1500 bytes but the size of the frame can be up to 1526 bytes (22 byte header, 4 byte CRC trailer).

See also fragmentation.
References in periodicals archive ?
Internet Optimization Modem Wizard probes the user's ISP to automatically detect the optimal maximum transmission unit (MTU) settings and RWIN settings, eliminating user guesswork.
appareNet can isolate many of the most common and onerous network problems, including full/half duplex conflicts, media errors or noisy links, incorrect maximum transmission units (MTUs), rate-limiting queues, and areas of congestion.

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