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In computer networking, the maximum transmission unit (MTU) is the size of the largest protocol data unit (PDU) that can be communicated in a single network layer transaction. [ 1 ] : 25 The MTU relates to, but is not identical to the maximum frame size that can be transported on the data link layer , e.g., Ethernet frame .
Path MTU Discovery (PMTUD) is a standardized technique in computer networking for determining the maximum transmission unit (MTU) size on the network path between two Internet Protocol (IP) hosts, usually with the goal of avoiding IP fragmentation. PMTUD was originally intended for routers in Internet Protocol Version 4 (IPv4). [1]
Continue transmission (with a jam signal instead of frame header/data/CRC) until minimum packet time is reached to ensure that all receivers detect the collision. Increment retransmission counter. Was the maximum number of transmission attempts reached? If so, abort transmission.
Maximum transmission unit, the size of the largest packet that a network protocol can transmit; Metric ton unit, in metals trading; Mobile Testing Unit, for COVID-19 in England, by NHS Test and Trace; Migrants' Trade Union in Korea, represents foreign workers in South Korea
In networking equipment, maximum jumbo frame size may be specified using either maximum frame size (maximum layer 2 packet size, includes frame headers) or maximum transmission unit (maximum layer 3 packet size, excludes frame headers), depending on the equipment's configuration interface. [citation needed]
These chunks are no larger than the maximum transmission unit of IP over Ethernet, or 1500 bytes. Each packet requires 20 bytes of IPv4 header information and 20 bytes of TCP header information, leaving 1460 bytes per packet for file data ( Linux and macOS [ 1 ] are further limited to 1448 bytes as they also carry a 12-byte time stamp).
In packet-switched computer networks, a jumbogram (portmanteau of jumbo and datagram) is an internet-layer packet exceeding the standard maximum transmission unit (MTU) of the underlying network technology. In contrast, large packets for link-layer technologies are referred to as jumbo frames.
Load balancing by per-packet multipath routing was generally disfavored due to the impact of rapidly changing latency, packet reordering and maximum transmission unit (MTU) differences within a network flow, which could disrupt the operation of many Internet protocols, most notably TCP and path MTU discovery.