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Configuring IP Path MTU Discovery

IP hosts transmit large amounts of data to other hosts using a series of IP datagrams. To best use resources, increase performance, and avoid difficult reassembly, hosts try to send datagrams that are as large as possible without requiring fragmentation anywhere along the path from the source to the destination. This datagram size is referred to as the path MTU (PMTU), and it is equal to the smallest MTU for each hop in the path.

Path MTU discovery is the process of discovering the PMTU value and using that value when transmitting TCP packets in datagrams.

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