US Robotics USR2410 Manual de usuario descargar pdf (Pagina 52)

number of hops on the Throughput and average packet delay (RTT) in both the TCP and UDP

protocols on the network. To test TCP traffic though the network a basic file transfer of a 5MB

file was used. To test the effect of UDP packets on the system, a continuous UDP packet stream

at a data rate of 200packets/s was applied to the system for 30 seconds using the D-ITG traffic

generator.

Both tests are to represent common applications of networks and the internet. The TCP test

represents a common file download where the UDP test represents a rudimentary example of a

streaming application such as video or audio. Each of the tests was performed for one through

three hops and repeated five times at each interval. Throughput and RTT were examined for each

test and recorded. As seen in Table 8-1 the testing parameters for each test are outlined.

Table 8-1: Testing Parameters for Number of Hops

TCP UDP

Runtime Time to complete 30s

# of Tests 5 5

Metrics Throughput Throughput

Avg. Pkt. Delay Avg. Pkt. Delay

Number of Hops 3 3

Data Recorder Ethereal D-ITG

Notes

Number of Ho

Conection made

through SSH File

transfer with SSH

Server and Client

D-ITG Test

used with 200

pkts/sec

running

In these tests we ran into a number of problems, as mentioned before a memory leak in the

madwifi driver, the tests had to be repeated often most of the time finishing incomplete due to a

system needing to unload and reload both Click and the driver to prevent a system crash. By the

third and fourth hop it was very difficult to complete five tests since usually at least one system

would crash during a test.

The data acquired from these tests are shown in Table 8-2 below.

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 106 107

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US Robotics USR2410 Manual de usuario Pagina 52