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A New Method for PMTU Discovery Using Split Path MTUs Disclosure Number: IPCOM000033372D
Original Publication Date: 2004-Dec-08
Included in the Prior Art Database: 2004-Dec-08

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Path Maximum Transmission Unit (PMTU) Discovery is the mechanism by which hosts discover the maximum message unit size that can be supported on a path without requiring fragmentation. However, the PMTU represents the LEAST Maximum Transmission Unit (MTU) size along that path. While this eliminates the need for fragmentation, it still generates a considerable number of packets and does not make optimal use of the cumulative MTUs along the path. Proposed is a split-path MTU discovery mechanism that makes optimal use of cumulative path-base MTU to reduce the number of packets in the network based on the hop count for the path. A new metric is introduced - the packet-hop count for a path, which represents the number of hops made by each packet along the path, from the source to the destination. The lower this value, the lesser number of packets going in the internet, and greater the performance of the overall data transfer. The goal is to provide a method to reduce this packet-hop count variable for a given data transfer.