cnp3-ebook

protocols/ipv6

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To solve these problems, IPv6 includes a packet fragmentation and reassembly mechanism. In IPv4, fragmentation was performed by both the hosts and the intermediate routers. However, experience with IPv4 has shown that fragmenting packets in routers was costly [KM1995]_. For this reason, the developers of IPv6 have decided that routers would not fragment packets anymore. In IPv6, fragmentation is only performed by the source host. If a source has to send a packet which is larger than the MTU of the outgoing interface, the packet needs to be fragmented before being transmitted. In IPv6, each packet fragment is an IPv6 packet that includes the `Fragmentation` header. This header is included by the source in each packet fragment. The receiver uses them to reassemble the received fragments.

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