Daily Archives: 02/04/2017

What is MTU and How to use it to locate network issues

Published / by Chen Ye / Leave a Comment

 

It is normal to see the TCP retransmission most of time which will cause lots of different network issue, packet drop etc. Today let’s have a short discussion about improper size of MTU caused packet drop during the transmission.

 

Definition

PDU Protocol Data Unit (describes a message at some protocol layer; sometimes used interchangeably and informally with packet, frame, datagram, segment, or message)

MTU Maximum Transmission unitThere is a limit on the size of the frame available for carrying the PDUs of higher-layer protocols in many link-layer networks such as Ethernet. For the Ethernet, usually limits the number of payload bytes to about 1500.

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