Mr. Osamu Honda Profile

Osamu Honda

at Osaka Univ

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Proceedings Article | 25 October 2005 Paper

Understanding TCP over TCP: effects of TCP tunneling on end-to-end throughput and latency

Osamu Honda, Hiroyuki Ohsaki, Makoto Imase, Mika Ishizuka, Junichi Murayama

Proceedings Volume 6011, 60110H (2005) https://doi.org/10.1117/12.630496

KEYWORDS: Control systems, Device simulation, Sensor networks, Satellites, Computer simulations, Time metrology

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TCP tunnel is a technology that aggregates and transfers packets sent between end hosts as a single TCP connection. By using a TCP tunnel, the fairness among aggregated flows can be improved and several protocols can be transparently transmitted through a firewall. Currently, many applications such as SSH, VTun, and HTun use a TCP tunnel. However, since most applications running on end hosts generally use TCP, two TCP congestion controls (i.e., end-to-end TCP and tunnel TCP) operate simultaneously and interfere each other. Under certain conditions, it has been known that using a TCP tunnel severely degrades the end-to-end TCP performance. Namely, it has known that using a TCP tunnel drastically degrades the end-to-end TCP throughput for some time, which is called TCP meltdown problem. On the contrary, under other conditions, it has been known that using a TCP tunnel significantly improves the end-to-end TCP performance. However, it is still an open issue --- how, when, and why is a TCP tunnel malicious for end-to-end TCP performance? In this paper, we therefore investigate effect of TCP tunnel on end-to-end TCP performance using simulation experiments. Specifically, we quantitatively reveal effects of several factors (e.g., the propagation delay, usage of SACK option, TCP socket buffer size, and sender buffer size of TCP tunnel) on performance of end-to-end TCP and tunnel TCP.

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