Fragmentation

• Datagrams larger than MTU are fragmented

• Original header is copied to each fragment and then modified (fragment flag, fragment offset, length,...)

• Some option fields are copied (see RFC 791)

IP Header

Original Datagram

IP Hdr 1

Data 1

IP Hdr 3

Data 3

IP Hdr 2

Data 2

Previous slide

Next slide

Back to first slide

View graphic version