Fragmentation and Reassembly header format

Ident = x

Offset = 0

0

1400 Bytes of data

Start of header

Rest of header

Unfragmented packet

Example of fragmented packet

(implementation is an exercise in bookeeping!)

M-bit set to zero indicating that there are no fragments to follow

Ident = x

Offset = 0

1

First 512 Bytes of data

Start of header

Rest of header

Ident = x

Offset = 512

1

Second 512 Bytes of data

Start of header

Rest of header

Ident = x

Offset = 1024

0

Last 376 Bytes of data

Start of header

Rest of header

Note: The offset field counts on 8-Byte units of data

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