Changes between Version 37 and Version 38 of GeniTmix


Ignore:
Timestamp:
10/16/12 10:06:47 (8 years ago)
Author:
Ben Newton
Comment:

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  • GeniTmix

    v37 v38  
    99
    1010== How does Tmix work? ==
    11  
    12 In order to perform realistic network simulations, one needs a traffic generator that is capable of generating realistic synthetic traffic in a closed-loop fashion that "looks like" traffic found on an actual network.
    13 
    14 The Tmix system takes as input a packet header trace file captured from a network link of interest (such as the link between the UNC campus and the rest of the internet). This trace is reverse-compiled into a connection vector (or cvec) file, which is a source-level characterization of each TCP connection present in the trace. Tmix then uses this information to emulate the socket-level behavior of the source application that created the corresponding connection in the trace. The resulting traffic generation is statistically representative of the traffic measured on the real link.
    15 
    16 == Traffic Generation ==
    17 One of the most complex components of empirical evaluations is modeling and generating
    18 realistic Internet traffic. The mix of the ever changing and varied applications that constitute the
    19 actual Internet traffic makes this a daunting task. Moreover, Internet traffic is different when
    20 sampled at different times and in different parts of the globe. Networking researchers have
    21 grappled with this problem by taking snapshots of Internet traffic at different times and at various
    22 points in the network, and modeling the same for generating traffic in the lab. The generally held 3
    23 belief is that the more realistic the traffic used, the more reliable are the results of the empirical
    24 evaluations using that traffic. Practice, however, does not adhere to this principle. So, although
    25 laboratory testbeds and methods for simulations have evolved over the years, the question about
    26 what constitutes essential components for modeling realistic traffic remains open for debate. For
    27 example, networking researchers agree that realistic traffic generation for empirical research is
    28 best accomplished by capturing traffic on a production link and then using source-level models to
    29 generate this traffic in the laboratory or simulator. Source-level models capture the application
    30 exchanges and application behavior on the ends (sources) of the TCP connections. But how do
    31 you go from the original captured traffic to an acceptable source-level model? Which of the
    32 several measures derived from the traffic sources should you model in your workload for your
    33 experiments? Would your modeling choices for traffic generation impact the outcome of your
    34 experiments? If yes, how significant would the impact be? These remain open questions. 
     11The Tmix system takes as input a TCP/IP packet header trace file captured from a network link of interest.  This trace is
     12reverse-compiled into a connection vector (or cvec) file, which is a source-level characterization of each TCP connection present in the trace. Tmix then uses this information to emulate the socket-level behavior of the source application that created the corresponding connection in the trace. The resulting traffic generation is statistically representative of the traffic measured on the real link.
    3513
    3614== How do I use Tmix? ==