Wireless LAN driver installation under Linux

Wireless APs (ap,access point, wireless access nodes, session points, or access bridges) is a very wide name, mainly has the routing switching access All-in-one device and the pure access point device, one device performs access and routing work, the pure access device is only responsible for the wireless client access, A pure access device is typically used as a wireless network extension, connected to other APS or primary APS to expand wireless coverage, and one device is generally the core of a wireless network.

The 802.11 protocol group is the International Institute of Electrical and Electronic Engineering (IEEE) standards for wireless local area networks.

The 1.802.11A Standard operates in the 5ghzu-nii band, with a physical layer rate of up to 54Mbps and a transmission layer rate of up to 25Mbps. can provide 25Mbps wireless ATM interface and 10Mbps wireless frame structure interface, as well as TDD/TDMA air interface, support voice, data, image services, a sector can be connected to multiple users, each user can bring multiple user terminals.

2.IEEE802.11B is a standard for wireless LANs. Its carrier frequency is 2.4GHz and the transmission speed is 11mbit/s. IEEE802.11B is the most famous and popular standard in all Wireless LAN standards.

3.IEEE 802.11g2003 July, the third standard of modulation was adopted. Its carrier frequency is 2.4GHz (same as 802.11B), the original transmission speed of 54mbit/s, the net transfer speed of about 24.7mbit/s (same as 802.11a).

4.IEEE802.11N,2004 January IEEE announces the formation of a new unit to develop the new 802.11 standard. The data transfer rate is estimated to be up to 475Mbps (the need to generate higher speeds at the physical layer), the new standard should be 45 times times faster than 802.11b, and about 8 times times faster than 802.11g. The 802.11n will also be more distant than the previous wireless network.

WEP provides cryptographic services to authorized wireless LAN users

WPA uses 802.1X and TKIP for WLAN access control, Key management, and data encryption. 802.1X is a port-based access control standard that users must pass authentication and authorization before they can use network resources over a port.

Features of the kernel

1. Hardware Drivers

2. Management process

3. Scheduling Tasks

4. Security

5. Network functions

6. File system

Using network card: fast//manufacturer fw300um//Model rtl8192cu//chip

Operation Steps

1. View chip lsub need to install usbutils-003-4.el6.i686

2. View kernel uname-v View kernel version

3. Chip website (realtek) Download Linux driver

4. Configuring, Compiling, installing

---lsmod//view kernel module –modprobe module name//load module

----Ifconfig–a//View all ports

5.ifconfig wlan0up//Activation wlan0

Iwconfig//Display the confidence information of WLAN

6.iwlist WLAN 0 scanning//scan wireless network

Note "Iwconfig iwlist package extended to Wireless-tools"

7.wpa_passphrase SSID >>/etc/wpa_supplicant/wpa_supplicant.conf

Enter the password for the link SSID Wireless network and write the results to the configuration file

8.wpa_supplicant-i wlan0-c/etc/wpa_supplicant/wpa_supplicant.conf-d Wext-b

Link Wireless Networks

Note: "Wpa_passphrasewpa_supplicant included in wpa_supplicant-0.7.3-4.el6_3.i686"

Pkill-9wpa_supplicant//Link failed to modify error after killing process relink

9.iwconfig//Show link success related information

10.dhclient wlan0//dynamic assignment of addresses with DHCP

11.echo "Wpa_supplicant-i wlan0-c

/etc/wpa_supplicant/wpa_supplicant.conf-d wext-b ">>/etc/rc.d/rc.local//write link wireless network instructions to boot script

echo "Dhclient wlan0" >>/etc/rc.d/rc.local

Write dynamically assigned IP address instructions to the boot script

13. The resulting DNS parameters are placed in the/etc/resolv.conf

This article is from the "Linux" blog, so be sure to keep this source http://simei.blog.51cto.com/10599598/1682803

Wireless LAN driver installation under Linux