MTU Issue

Unanswered Question
May 14th, 2009
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Two routers are connected by switch. One interface is having interface mtu of 1500 bytes and another router interface is having mtu of 1600 bytes. The weird thing is that the packets are not get fragmented and we are able to ping 1514 bytes data size. What the reason for this? If anyone knows please help.


R1--1500-----Switch-----1600--R2



regards

shivlu jain

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htarra Wed, 05/20/2009 - 06:17
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There are several issues that make IP fragmentation undesirable. There is a small increase in CPU and memory overhead to fragment an IP datagram. This holds true for the sender as well as for a router in the path between a sender and a receiver. Creating fragments simply involves creating fragment headers and copying the original datagram into the fragments. This can be done fairly efficiently because all the information needed to create the fragments is immediately available.



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