MTU is short for maximum transmission unit. When two devices on one network communicate with each other, the MTU of the network plays an important role. An MTU value determines the maximum number of bytes that can be transmitted by the sender at a time. If the MTU exceeds the maximum number of bytes supported by the receiver or a transit device, packets are then fragmented or even discarded, thus aggravating the network transmission load. In view of this, devices have to calculate a correct MTU before communication so that packets can reach the receiver successfully.

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