A Maximum Transmission Unit (MTU)
is the largest size packet or frame, specified in octets
(eight-bit bytes), that can be sent in a packet- or frame-based network such as
the Internet. The Internet's Transmission Control Protocol
(TCP) uses the
MTU to determine the maximum size of each packet in any transmission. Too large
an MTU size may mean retransmissions if the packet encounters a router that can't handle that large a
packet. Too small an MTU size means relatively more header overhead and more
acknowledgements that have to be sent and handled.
Most computer operating systems provide a default MTU value that is suitable for most users. In general, Internet users should follow the advice of their Internet service provider (ISP) about whether to change the default value and what to change it to.
Most computer operating systems provide a default MTU value that is suitable for most users. In general, Internet users should follow the advice of their Internet service provider (ISP) about whether to change the default value and what to change it to.
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