Sep 112008

Path maximum transmission unit (PMTU) discovery is the process of discovering the maximum size of packet that can be sent across the network between two hosts without fragmentation (that is, without the packet being broken into multiple frames during transmission). By discovering the path MTU (PMTU) and limiting TCP segments to this size, TCP can eliminate fragmentation at routers along the path that connects networks with different MTUs. Fragmentation adversely affects TCP throughput and network congestion.

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