Abstract
This chapter discusses three hardware hacks for wireless networking products. The first hack modifies a D-Link DWL-650 wireless network interface card (NIC) to add an external antenna. Most consumer-grade cards do not provide an external antenna connection. Those that do are generally more expensive. However, the D-Link card can be modified to give it support for an external antenna with relative ease. The second hack explores OpenAP, an open-source Linux distribution from Instant802. The OpenAP software allows reprogramming certain brands of off-the-shelf access points with a fully functioning Linux operating system. The hack uses a U.S. Robotics USR 2450 AP. The USR 2450 has a special jumper on the motherboard that, when shorted, will cause the AP to boot from a static random-access memory (SRAM) card if one is inserted into the PCMCIA slot. By removing the wireless NIC from the PCMCIA slot and replacing it with a preprogrammed SRAM card containing an OpenAP image file, one can “reflash” the AP's on-board Flash memory. The third hack explores the inner workings of the Dell 1184 Access Point. The Dell 1184 contains an embedded Linux distribution. No special tools or reprogramming is necessary and one can simply Telnet to the device on port 333 and gain complete access.
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