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The success of this simple, elegant model in capturing the characteristics of measured traf c traces is surprising given that it ignores nonlinearities arising from the interaction of traf c sources contending for network resources, which in real networks can be as complicated as the feedback congestion control algorithm of TCP To apply the framework of the on=off model to real networks, it is necessary to understand whether the model's limitations affect its usefulness and how these limitations manifest themselves in practice In this chapter, we show that in a ``realistic'' client=server network environment that is, one with bounded resources leading to the coupling of multiple traf c sources contending for shared resources the degree to which le sizes are heavy tailed directly determines the degree of traf c self-similarity.

Although MSIE can't browse cache files directly, HTML pages can reference cache files by explicit name Thus, the file: URL, if properly constructed, can invoke the Java class..

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If you examine some of the recently passed and pending legislation at the federal and state levels and attempt to predict the trend, you begin to see a struggle between privacy advocates who want little or no government mandates involving identity and those who want to find a way to simplify identity methods that can be still be trusted, on- and offline. Legislation to protect the use of or limit use of personally identity information such as Social Security numbers is currently on the agenda. The prediction is that legislators would eventually also recognize that three other elements of identity deserve protection equal to SSN from predators and wrongdoers. Those elements are date of birth, driver s license number, and credit and financial account numbers. The challenge for governments, both state and federal, is how they can participate in a global access control scheme that universally works, is derived from true identity information and yet discloses none of it, and appreciably retains some elements of control by the individual citizen concerned. It is easily expected that the state and federal governments would continue to play their roles as regulators of the commercial processes in use. You expect the law to lag behind events and to codify what is already reality. Rarely do government initiatives lead the way with technical change.

Speci cally, measuring self-similarity via the Hurst parameter H and le size distribution by its power-law exponent a, we show that there is a linear relationship between H and a over a wide range of network conditions and when subject to the in uence of the protocol stack The mechanism gives a particularly simple structural explanation of why self-similar network traf c may be observed in many diverse networking contexts We discuss a traf c-shaping effect of TCP that helps explain the modulating in uence of the protocol stack We nd that the presence of self-similarity at the link and network layer depends on whether reliable and ow-controlled communication is employed at the transport layer.

In the absence of reliability and ow control mechanisms such as when a UDP-based transport protocol is used much of the self-similar burstiness of the downstream traf c is destroyed when compared to the upstream traf c The resulting traf c, while still bursty at short ranges, shows signi cantly less long-range correlation structure In contrast, when TCP (Reno, Tahoe, or Vegas) is employed, the long-range dependence structure induced by heavy-tailed le size distributions is preserved and transferred to the link layer, manifesting itself as scale-invariant burstiness We conclude with a discussion of the effect of self-similarity on network performance We nd that in UDP-based non- ow-controlled environment, as self-similarity is increased, performance declines drastically as measured by packet loss rate and mean queue length If reliable communication via TCP is used, however, packet loss, retransmission rate, and le transmission time decline gracefully (roughly linearly) as a function of H.

The applet stuffed in your cache is a port scanner. The port-scanning attack works because an applet is allowed to open a socket connection back to where it came from. And guess where it came from: Yep, the client machine. So a port scan is carried out by their cache-bomb applet. Unlike the Steal This IP Address problem, port scanning is very serious. Using this attack, a cracker might be able to discover things like weak sendmails listening on port 25, leaving only the problem of getting the port-scan information back to the cracker site. Accomplished crackers can simply use the URL-lookup covert channel to do this. Unfortunately, this approach is only one of many ways of sending interesting tidbits out from an applet.

The exception is mean queue length, which shows the same superlinear increase as in the unreliable non- ow-controlled case This graceful decline in TCP's performance under self-similar loads comes at a cost: a disproportionate increase in the consumption of buffer space The sensitive.

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