![]() ![]() It was never envisioned to be the Internet we have today. Remember that IPv4 was a government/academic experiment that escaped the lab and got out of control. To overcome this difficulty, aįragmentation mechanism is provided in the internet protocol. ![]() In the routing of messages from one internet module to another,ĭatagrams may need to traverse a network whose maximum packet size is Reassemble internet datagrams when necessary for transmission through The internet modules use fields in the internet header to fragment and The internet protocol implements two basic functions: addressing and Of long datagrams, if necessary, for transmission through "small The internet protocol also provides for fragmentation and reassembly RFC 791, Internet Protocol explains about fragmentation: With fragmentation, the router can fragment the packet into smaller packets that can be sent on the ethernet network. ![]() If a host on a network sends a 4000 byte packet to an ethernet network where the maximum packet size is 1500 bytes, without fragmentation, the router would need to simply drop the packet. the original serial WAN connections could have maximum packet sizes of greater than 4000 bytes, but ethernet specifies a maximum packet size of 1500 bytes. Each network can have a different maximum packet size.įor example. IP is designed to send packets from one network to another network. One of the two basic functions for IPv4 is packet fragmentation (the other is addressing). ![]()
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