Patent ID: 9240939
Filing Date: 2016-01-19
CPC Classification: H04L

Claim Text:
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.