Most IP datagram reassembly algorithms have a timer to avoid having a lost fragment tie up reassembly buffers forever. Suppose that a datagram is fragmented into four fragments. The first three fragments arrive, but the last one is delayed. Eventually, the timer goes off and the three fragments in the receiver's memory are discarded. A little later, the last fragment stumbles in. What should be done with it?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Most IP datagram reassembly
algorithms have a timer to avoid
having a lost fragment tie up
reassembly buffers forever.
Suppose that a datagram is
fragmented into four fragments.
The first three fragments arrive,
but the last one is delayed.
Eventually, the timer goes off and
the three fragments in the
receiver's memory are discarded.
A little later, the last fragment
stumbles in. What should be
done with it?
Transcribed Image Text:Most IP datagram reassembly algorithms have a timer to avoid having a lost fragment tie up reassembly buffers forever. Suppose that a datagram is fragmented into four fragments. The first three fragments arrive, but the last one is delayed. Eventually, the timer goes off and the three fragments in the receiver's memory are discarded. A little later, the last fragment stumbles in. What should be done with it?
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