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a study on network secur

a study on network secur

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CHAPTER 1

INTRODUCTION

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1. INTRODUCTION

The fundamental philosophy behind the Internet is expressed by the scalability argument: no

protocol, mechanism, or service should be introduced into the Internet if it does not scale well. A

key corollary to the scalability argument is the end-to-end argument: to maintain scalability,

algorithmic complexity should be pushed to the edges of the network whenever possible.

Perhaps the best example of the Internet philosophy is TCP congestion control, which is

implemented primarily through algorithms operating at end systems. Unfortunately, TCP

congestion control also illustrates some of the shortcomings the end-to-end argument. As a result

of its strict adherence to end-to-end congestion control, the current Internet suffers from main

maladies: congestion collapse from undelivered packets.

The Internet’s excellent scalability and robustness result in part from the end-to-end nature of

Internet congestion control. End-to-end congestion control algorithms alone, however, are unable

to prevent the congestion collapse and unfairness created by applications that are unresponsive to

network congestion. To address these maladies, we propose and investigate a novel congestion-

avoidance mechanism called Network Security and Maintenance (NSM).

NSM entails the exchange of feedback between routers at the borders of a network in order to

detect and restrict unresponsive traffic flows before they enter the network, thereby preventing

congestion within the network.

Modern organizations have a huge challenge on their hands, on a scale unlike anything they’ve

seen since the Y2K crisis. They must “secure” the organization in the face of increasing

complexity, uncertainty, and interconnection brought about by an unprecedented reliance on

technology to accomplish their mission. They must also stay mindful of the heavy hand of

regulation as legislators discover the importance of security. This paper explores some of the

challenges that organizations must overcome to be successful in this environment and introduces

ways in which a change in perspective might be the impetus for an emerging mission-driven

approach to security.

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CHAPTER 1 INTRODUCTION 1. INTRODUCTION The fundamental philosophy behind the Internet is expressed by the scalability argument: no protocol, mechanism, or service should be introduced into the Internet if it does not scale well. A key corollary to the scalability argument is the end-to-end argument: to maintain scalability, algorithmic complexity should be pushed to the edges of the network whenever possible. Perhaps the best example of the Internet philosophy is TCP congestion control, which is implemented primarily through algorithms operating at end systems. Unfortunately, TCP congestion control also illustrates some of the shortcomings the end-to-end argument. As a result of its strict adherence to end-to-end congestion control, the current Internet suffers from main maladies: congestion collapse from undelivered packets. The Internet’s excellent scalability and robustness result in part from the end-to-end nature of Internet congestion control. End-to-end congestion control algorithms alone, however, are unable to prevent the congestion collapse and unfairness created by applications that are unresponsive to network congestion. To address these maladies, we propose and investigate a novel congestion-avoidance mechanism called Network Security and Maintenance (NSM). NSM entails the exchange of feedback between routers at the borders of a network in order to detect and restrict unresponsive traffic flows before they enter the network, thereby preventing con ...
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