Fragmentation

  • Fragmented data units may reach the destination through independent paths.
  • There may be a need for further fragmentation.

IP Packet fields used in Fragmentation:

Fig: IPv4 packet
Fig: Fragmentation

Key Takeaways:

  • When DF = 1
  • When DF = 0
  • It is as large as possible but less than or equal to MTU.
  • It is a multiple of 8 so that pure decimal value can be obtained for the fragment offset field.
  • It is not compulsory for the last fragment to contain the amount of data that is a multiple of 8.

Efficiency

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