<Tr> <Th> Media for IP transport </Th> <Th> Maximum transmission unit (bytes) </Th> <Th> Notes </Th> </Tr> <Tr> <Td> Internet IPv4 path MTU </Td> <Td> At least 68, max of 64 KiB </Td> <Td> Practical path MTUs are generally higher . Systems may use Path MTU Discovery to find the actual path MTU . Routing from larger MTU to smaller MTU causes IP fragmentation . </Td> </Tr> <Tr> <Td> Internet IPv6 path MTU </Td> <Td> At least 1280, max of 64 KiB, but up to 4 GiB with optional jumbogram </Td> <Td> Practical path MTUs are generally higher . Systems must use Path MTU Discovery to find the actual path MTU . </Td> </Tr> <Tr> <Td> Ethernet v2 </Td> <Td> 1500 </Td> <Td> Nearly all IP over Ethernet implementations use the Ethernet V2 frame format . </Td> </Tr>

What happens if a packet is larger than the mtu defined for an interface