Evolução da conectividade fim-a-fim da Internet

Abstract

The Internet is a system under continuous evolution. In this dissertation, it is characte rized and analyzed the recent end-to-end connectivity evolution of the Internet, comparing key end-to-end performance metrics from two distinct periods separated by five years. The findings show that the average path length distribution remains virtually unchanged from 2006 to 2011, but the delay distribution actually became worse, with a 45% increase in path delay from 2006 to 2011. This directly affects network performance and degrades user experience. Furthermore, it is shown that path diversity decreased, and accordingly, distinct paths became slightly more similar. This result has a direct impact on routing algorithms that try to explore path diversity to become more fault-tolerant. Later it was studied more deeply the phenomenon known as bufferbloat, which is one of the possible causes of the apparent increase of latency. The results show that large buffers can strongly degrade the network performance, but they also show that the problem is not likely to occur in Unix Like machines with default settings.