Fragmentation Algorithm


Remove header from packet
Save it for later
Divide payload of packet into sections
each small enough for MTU after header is re-attached
Put modified header on each fragment
Total Length
length of fragment (plus its header)
M
set to 1 in all but last fragment generated
In last, copied from original packet
Fragment Offset
in first fragment generated copied from original packet
in all other fragments
previous fragment offset field + length of its payload / 8
All other fields
copied from original packet

Done!