Web100: extended TCP instrumentation for research, education and diagnosis
ACM SIGCOMM Computer Communication Review
Pathdiag: automated TCP diagnosis
PAM'08 Proceedings of the 9th international conference on Passive and active network measurement
Design and Evaluation of Techniques for Resilience and Survivability of the Routing Node
International Journal of Adaptive, Resilient and Autonomic Systems
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IEEE 802.3 Ethernet networks, a standard LAN environment, provide a way to auto-negotiate the settings of capacity (10, 100, or 1000 Mb/s) and duplex (full- or half-). Under certain conditions described below, the auto-negotiation protocol fails to work properly. The resultant configuration problem, duplex mismatch, appears to be common; when this problem occurs, the connectivity is impaired, but not completely removed. This can result in performance problems that are hard to locate. This paper describes a work in progress aimed at (i) studying the condition of duplex mismatch in IEEE 802.3 Ethernet networks, (ii) producing an analytical model of duplex mismatch, (iii) validating the model, (iv) studying the effects of duplex mismatch on TCP throughput, (v) designing an algorithm for duplex mismatch detection using data from active testing, and (vi) incorporating the detection algorithm into an existing open-source network troubleshooting tool (NDT).