US Robotics USR2410 Manual de usuario descargar pdf (Pagina 30)

abstraction layer (HAL) module that is called ath_hal. The ath_pci module allows the kernel and

networking utilities to interact with the device, and uses the ath_hal module to interact with the

device itself. The Madwifi driver is open sources, however the HAL is not, as that would allow

users to modify it to access frequency ranges not defined in the 802.11 standards.

The Madwifi driver worked well for this project, as it was able to go into ad-hoc mode, and could

be used in both 802.11g, for debugging purposes, and 802.11a channels. By using this driver the

mesh network was assembled as proposed. However, when testing it was discovered that the

mesh routers were running out of memory and crashing. This was traced back to the Madwifi

driver, to a problem that had been reported on the Madwifi website on February 9

, 2006 [At the

time of writing, the report was available at: http://madwifi.org/ticket/377]. Testing created a high

amount of traffic, much more than regular web or email traffic generated by one or two users, and

this was causing the mesh routers to crash. Due to this problem, the testing was not completed as

proposed. Please see Chapter 7 for more details.

Another option that would have allowed the wireless cards to work under the Linux operating

system was the ndiswrapper module. This module is a wrapper for windows drivers, that allows

them to be used under Linux. As this is a wrapper, the performance compared to the madwifi

driver would have been much slower.

4.3

Orinoco Driver

To support the U.S. Robotics USR2410 wireless card, the Orinoco driver was used. This driver

supports Prism based wireless cards, including the U.S. Robotics card used in this project. The

wireless card and this driver were installed and configured in the Client Gateway Router to allow

wireless clients access to the mesh network.

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 106 107

Sin comentarios

US Robotics USR2410 Manual de usuario Pagina 30