Importance

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Abstract

This invention comprises auto-diagnosis logic that can be implemented in operating systems in an appliance-like auto-diagnosis module coupled to the TCP receiver, the TCP sender or both. TCP events are sampled and a set of statistics on these events is maintained. Receiver side TCP diagnostic techniques include detecting sender's re-transmission timeouts, evaluating the average size of packets being received, determining if a receiver is a bottleneck, and performing other evaluations of an incoming data stream. Sender side diagnostic techniques include flagging transmission timeouts, monitoring the average size of a transmitted packet, evaluating if the advertised window accounts for the delay-bandwidth product of the network connecting the receiver and the sender systems, performing bottleneck checks, and other evaluations of an outgoing data stream. The results are aggregated using system attributes. Systems with common problem areas and attributes are grouped together. The TCP auto-diagnosis logic can be performed on-line or off-line.

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First Claim