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In this paper, the authors present Netalyzr, a network measurement and debugging service that evaluates the functionality provided by people's Internet connectivity. The design aims to prove both comprehensive in terms of the properties they measure and easy to employ and understand for users with little technical background. They structure Netalyzr as a signed Java applet (which users access via their Web browser) that communicates with a suite of measurement specific servers. Traffic between the two then probes for a diverse set of network properties, including outbound port filtering, hidden in-network HTTP caches, DNS manipulations, NAT behavior, path MTU issues, IPv6 support, and access-modem buffer capacity.
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