The madwifi-ng driver is used for the atheros chipsets. This driver does not support any USB atheros devices. However, Atheros acquired Zydas which makes USB chipsets (zd1211 and zd1211b). Atheros has renamed this chipset to AR5007UG. The AR5007UG chipset is NOT supported by the madwifi-ng driver, but it is recommended, because its one of the cheapest chips (about 5, 6$ on eBay) supported by aircrack-ng and offers reliable and stable operation for wireless connectivity. Starting with 2.6.24, AR5007UG(zd1211/zd1211b) can be used with zd1211rw. Madwifi-ng is deprecated and now most supported cards by madwifi-ng should be supported by ath5k or ath9k.
Another USB chipset, AR9170, which covers Atheros and Zydas chipsets (zd1221) also provides aircrack-ng support with a mac80211 driver called carl9170. So does the ath9_htc for USB chips: AR9271 and AR7010.
Cards containing the Realtek RTL8187L chipset work quite well and is recommended. The driver patch for this chipset has been continuously improved and quite good at this point in time. The Alfa AWUS036H is a very popular card with this chipset and it performs well the aircrack-ng suite. This chipset is not to be confused with the RTL8187B, which is nowhere near as tested as RTL8187L.
New laptops now normally come with ExpressCard slots. The current problem is that there are not a lot of ExpressCard wireless cards which are compatible with the aircrack-ng suite. However, ExpressCard to PCMCIA/Cardbus adapters have appeared in the market.
De forma alternativa, también es posible saber si nuestra tarjeta de red Wi-Fi admite modo monitor al instalar la suite aircrack-ng en nuestra distribución, así como utilizar distribuciones orientadas a las auditorias Wi-Fi, como puede ser WifiSlax o Kali Linux. Cuando lo tengamos instalado, tenemos que ejecutar el comando airmon-ng. 2b1af7f3a8