Dummynet and Forward Error Correction
نویسنده
چکیده
In this paper we present a couple of tools developed by the author on FreeBSD and available from the author s Web page in source format The rst one called dummynet is a tool designed for the perfor mance evaluation of network protocols and appli cations Despite its original design goal there has been a lot of interest on using dummynet as a band width manager in network servers dummynet sim ulates the e ect of nite queues bandwidth limita tions and queueing delays and is embedded in the protocol stack of the host allowing even complex experiments to be run on a single machine using existing applications and protocol implementations The second tool is a software implementation of an erasure code especially suited for use in network pro tocols Erasure codes are used in Forward Error Correction FEC techniques to reduce or remove the need for retransmissions in presence of commu nication errors FEC has been rarely used in net work protocols because of the encoding decoding overhead and also because the underlying theory of error correcting codes is generally not well known to network researchers In this paper we discuss the theory behind a simple erasure code and pro vide performance data to show that the encod ing decoding overhead is acceptable for many ap plications even on low end machines
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تاریخ انتشار 1998