ICMPv6 Packet Too Big Messages
One of the most interesting changes made to the operation of IP in version 6 is related to the process of datagram fragmentation and reassembly. In IPv4, a host can send a datagram of any size that's allowed by the IP specification out onto the internetwork. If a router needs to send the datagram over a physical link that has a maximum transmission unit (MTU) size that is too small for the size of the datagram, it will automatically fragment the datagram and send the fragments individually so they will fit. The destination device will receive the fragments and reassemble them. I explain the basics behind this in Chapter 22.
Even though it is convenient for hosts to be able to rely on routers to automatically fragment ...
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