Path MTU: is to the lowest MTU of an interface on the path between the source and destination. We can’t really understand how MTU is playing a part in network operations, without understanding the concept of path MTU. Whether the headers are included or not is an implementation that can vary from box to another and from OS to another, so it should always be tested out specially when operating on a multivendor environment. When the word MTU is used plainly, we are typically referring to the interface MTU, but when talking about a protocol MTU (e.g IP MTU, MPLS MTU) we are typically referring to the maximum payload of the protocol itself. What is MTU?Ī maximum transmission unit ( MTU) is the largest length of a packet that can be transmitted out of an interface toward a destination. Each packet contains information to help devices route or switch the packet to its destination and actual data known as payload. What is a data packet?Ī packet is the single unit of data that is routed between a source and a destination on the network. Let’s build up these concepts from scratch. On the other hand MRU which I was discussing today with a college or maximum receive unit is not talked about as much, probably because it rarely pops up in problems or configuration requirements and it typically matches MTU by default, but doesn’t have to be. Here is an example for such confusion MTU and ping size confusion. One reason for that is the difference in implementations used by different vendors or even between different OS versions or equipment from the same vendor. MTU typically becomes an issue of concern during network changes, like adding new vendors equipment or upgrading to a new software. Although it’s a simple concept, it causes a lot of confusion specially for those who are new to the field. MTU or Maximum transmission unit is a topic that pops up every once in a while in different discussions.
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