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Transport Segment Passive Performance Monitoring

The goal of this effort is real-time, always on, passive network monitoring of key network metrics that impact application performance. Passive approaches only make use of the existing packet stream without adding or modifying packets in the network.

(TSDE) Transport Segment Delay Estimator

Funded by a U.S. Department of Energy Small Business Innovation Research (SBIR) grant (currently in Phase II), Pollere has first focused on measuring and isolating network delay.

The delay experienced by application packets is a powerful Internet diagnostic. Network problems (like bufferbloat or high loss rates) and end-node problems (like receiver or sender window limits) are both visible in packet round trip delays. Round trip delays have long been measured by end-node protocols to diagnose and repair loss. But this high quality diagnostic information is only available to the end nodes while other network elements have made do with less capable measures such as the ping matrices produced by an active probing mesh.

Pollere has developed tools that extract high-quality round-trip and one-way delay information from passively collected application packet samples. The sampling can be done anywhere in the network and doesn't require samples from both directions of a flow (e.g., the tools work in the presence of asymmetric routing and multipath). Because the information is mined from application traffic, it measures everything that happens to the that traffic. So, for example, samples taken on the one end of a campus peering link could be used not only to identify prefixes experiencing significant bufferbloat but also to localize the delay, determining whether the bottleneck was inside the campus network, in the measuring ISP, or on the path to the remote destination.

The leading edge NETCONF protocol (RFC6241) is used to securely manage TSDE's configuration and data in a standards-based Network Management architecture

More information on TSDE

We took our prototype TSDE for a spin in a home network and found some interesting behavior. Warning: misconceptions and misperceptions may occur but we are happy to be better informed. See our Fun With TSDE note.

For more information on TSDE, contact info@pollere.net.

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