Transmission Control Protocol (TCP) is the core of the Internet carry out the communication and delivery of all types of data and connect millions of computers around the world. In this paper an investigation of the performance of TCP flavors namely Reno, NewReno, Vegas and SACK based on the Bandwidth performance and the actual throughput. The network topology is a satellite network and it had been configured into different scenarios to enlarge the chances to get the desired goal. Simulation methodology is used in this study using OPNET simulation tool. The objective was to investigate and find out the performance of TCP variants according to the bandwidth in satellite network. However, the results are shocking, TCP Reno is the maximum aggressive, and greatest amount of throughput. In TCP NewReno, it follows Reno's steps by becoming the second maximum aggressive, and second highest throughput. SACK is reasonable to Reno and NewReno, but when it is compared with Vegas, it clears that it is very unfair. Lastly, Vegas shows the highest degree of fairness (minimum aggressive) and also Vegas produces the lowest amount throughput.
Table of Contents
I. INTRODUCTION
II. CURRENT STATUS OF TCP
III. TCP VARIANTS
IV. OPNET SIMULATION TOOL
V. SIMULATION Topologies
VI. Simulation Results
A. First scenario
B. Second Scenario
C. Third Scenario
D. Forth scenario
E. Fives scenario
F. Sixes scenario
VII. Result discussion
VIII.Conclusion
Research Objectives and Key Topics
The primary objective of this research is to investigate and evaluate the performance of different Transmission Control Protocol (TCP) flavors, specifically Reno, NewReno, Vegas, and SACK, within a satellite network environment. The study aims to determine how these variants perform in terms of bandwidth utilization and throughput by configuring various network scenarios and analyzing their behavior under congestion.
- Performance analysis of TCP Reno, NewReno, Vegas, and SACK.
- Evaluation of bandwidth and effective throughput metrics.
- Implementation of network simulation using the OPNET tool.
- Comparison of fairness and aggressiveness levels among different TCP variants.
- Modeling of complex satellite network topologies.
Excerpt from the Book
I. INTRODUCTION
Certainly, TCP is a component of TCP/IP internet protocol suite. However; it is definitely considered as an independent, general purpose protocol since that it can be used with other delivery systems. TCP protocol makes very minor assumptions about the underlying network, for example it is possible to employ TCP over single network just like an Ethernet or even over complex networks such as the global Internet [1]. Indeed, it is the dominant transport protocol over both wired and wireless links [2].
The problems that arise when a Network underperforms are exceptionally huge. There is Internet underperforms in the public and private organizations across the whole industries that make use of Internet. This will be affected in terms of the cost, the quantity and the quality of services offered.
Today TCP/IP networks are used frequently and many people experience it from fixed locations (home, school, and office) or from mobile devices while people are on the move [3]. Poor performance of TCP/IP networks will absolutely not be tolerated.
Since there are many different flavors (variants) of TCP, then definitely their performance differs from one flavor to another and from one environment to another. If the TCP engine is not optimized then the high performance of TCP/IP network will be greatly hampered. There are more than nine (9) concepts that can be associated with the performance of TCP and one of these concepts is Bandwidth or effective throughput.
Bandwidth or effective throughput is one of the metrics of the TCP performance. It means the number of applications bytes sent over the network or transferred in seconds and when it comes to the transfer of large files then the effective throughput application (speed or bandwidth of the connection) becomes a key performance measure.
Summary of Chapters
I. INTRODUCTION: Provides an overview of the TCP/IP protocol, its dominance in modern networking, and the critical need for optimizing throughput in satellite networks.
II. CURRENT STATUS OF TCP: Discusses recent research regarding congestion control mechanisms, such as Quick-Start, and how they function in various network environments.
III. TCP VARIANTS: Details the characteristics of different TCP flavors including Reno, NewReno, Vegas, and SACK, highlighting their unique congestion control mechanisms.
IV. OPNET SIMULATION TOOL: Explains the functionality of the OPNET Modeler and its application in creating large-scale network simulations for performance modeling.
V. SIMULATION Topologies: Describes the network configurations and specific parameter settings used for the experimental simulation of competing TCP variants.
VI. Simulation Results: Presents the findings of the six distinct simulation scenarios, comparing the throughput of different TCP variants via graphical data.
VII. Result discussion: Synthesizes the experimental data and confirms the varying degrees of aggressiveness and fairness among the tested TCP flavors.
VIII.Conclusion: Summarizes the comparative study and emphasizes the necessity for developing hybrid algorithms to optimize future TCP engine performance.
Keywords
TCP/IP Protocol, TCP flavors, satellite networks, OPNET Simulation, Throughput, Network Performance, Congestion Control, Bandwidth, Data Transfer, Network Topology, Reno, NewReno, Vegas, SACK, Optimization
Frequently Asked Questions
What is the core focus of this research paper?
This paper focuses on investigating and comparing the performance of four specific TCP variants—Reno, NewReno, Vegas, and SACK—within a simulated satellite network environment.
What are the central themes addressed in the study?
The central themes include network congestion, throughput efficiency, TCP variant behaviors, and the role of simulation tools in optimizing network performance.
What is the primary objective or research question of the work?
The primary objective is to evaluate how different TCP flavors perform in terms of bandwidth and effective throughput when operating over satellite network topologies.
Which scientific methodology is utilized?
The researchers use a simulation-based methodology, specifically employing the OPNET simulation tool to model six different network scenarios involving competing TCP variants.
What topics are covered in the main section of the paper?
The main sections cover the overview of current TCP status, the specific mechanisms of various TCP flavors, the configuration of simulation topologies, and a detailed analysis of the gathered performance results.
Which keywords best characterize this work?
The work is characterized by terms such as TCP/IP protocol, throughput, OPNET simulation, satellite networks, and congestion control.
Which TCP variant demonstrated the highest degree of fairness?
According to the simulation results, TCP Vegas showed the highest degree of fairness, although it also produced the lowest amount of throughput among the tested variants.
How does TCP Reno compare to the other variants in terms of aggressiveness?
TCP Reno was found to be the most aggressive TCP flavor, consistently achieving the highest throughput but often behaving in an unfriendly manner toward other competing flows.
What specific simulation tool was used for the network modeling?
The study utilized the OPNET Modeler, a powerful network simulation tool set designed for creating and testing large network environments.
- Quote paper
- Elsadig Gamaleldeen Elsadig Karar (Author), 2018, Investigating TCP Flavors Performance in Satellite Networks, Munich, GRIN Verlag, https://www.grin.com/document/436906
