##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
Putting it together
Reassembly happens at the destination, not routers.
The process:
Receive fragment, note ID
Buffer it, track offset
Continue until MF=0 fragment arrives
Verify contiguous offsets
Reassemble and pass up
Timeout applies. Incomplete fragments are discarded after - seconds.
Problems: lost fragment = lost packet. Modern practice avoids fragmentation via PMTUD.
