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Detecting packet loss and retransmission in a network environment

  • US 9,240,939 B2
  • Filed: 10/22/2013
  • Issued: 01/19/2016
  • Est. Priority Date: 10/22/2013
  • Status: Active Grant
First Claim
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1. A method for detecting end-to-end packet loss and retransmission occurring in a connection of a network environment, the method comprising:

  • monitoring packets transmitted from a sender to a receiver and acknowledgement packets from the receiver to the sender using a probe located in a path between the sender and the receiver in the network environment;

    maintaining a two-state variable for storing either;

    (1) a missing sequence number in the sequence numbers of packets observed before the first packet, or (2) a no-gap value which indicates that the sequence numbers of packets observed before the first packet do not have a missing sequence number;

    identifying, by the probe, a first packet as a possibly-retransmitted packet if the first packet has a fall back sequence number; and

    if the two-state variable holds a no-gap value, classifying, by the probe, the possibly-retransmitted packet as a retransmitted packet.

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