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A router is normally connected to different link (networks), each with different MTU. The link from which the packet is received may have a larger MTU than the link to which the packet is sent, which means that router needs to fragment the packet. IPv6 does not allow fragmentation at the router, which means the source needs to do some investigation and make the packet small enough to be carried through all links.

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Chuck Norris's OSI network model has only one layer - Physical.