US Robotics USR2410 Manual de usuario descargar pdf (Pagina 46)

reconfigured, and the Click Modular Router started again. As this is what meshstart did,

memwatch then executed meshstart and exited.

The meshstart script redid all the steps previously done during boot up. When meshstart was

finished the system was setup once again as a mesh router, and memwatch was started to watch

for low memory again.

It was found that during heavy testing memwatch was effective in keeping the mesh routers up

and running. However, due to the nature of the mesh routing, by starting and stopping the Click

Modular Router, some machines were slow when re-establishing a connection to the mesh

network. During internet traffic usage with one or two clients, the memory leak in the Madwifi

module was not as noticeable, and memwatch usually did not need to release the memory.

6.1.3

Logging

As there was a need to keep track of the problems that occurred, and to determine the state of the

network while the mesh routers were running, relevant data was logged. These logs were

especially important during the testing of the implementation, as monitors were not available

when the mesh routers were deployed. These logs included the times at which meshstart was run,

and any problems that were encountered during its execution. Also logged were the times when

memwatch needed to free memory filled by the leak in the module. For general system

information, the syslog-ng system logger was used. This program was installed on each machine

using Gentoo's Portage distribution system. It logged operating system information such as

system initialization data, login times, and all data coming from the kernel. The system logger

also kept track of output from the Click Modular Router when it was run as a kernel module.

This data allowed the routing table changes and updates to be seen, as well as any errors that the

router encountered. Debug packet flow information from the Click Modular Router was also

printed to this log.

6.1.4

System Replication

Due to the software requirements of both Click and Madwifi, as well as the manual nature of the

Gentoo installation process, the time it took to set up a machine was sizeable. It was also

required that each machine be identical to each other. Due to these requirements, a process to

copy the entire hard drive from one system onto all the others was created. Due to the nature of

the Linux operating system, hard drives are represented as device files. To copy the entire

contents of one hard drive to another the commands in Table 6-2 were used.

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US Robotics USR2410 Manual de usuario Pagina 46