Installing Broadcom drivers : Kali Linux

1.     This post will show the installation of Broadcom's official Linux hybrid wireless driver. Using a Broadcom wireless USB adapter gives us the greatest possibility of success in terms of getting our wireless USB access point to work on Kali.

2.    Open a terminal window and download the appropriate Broadcom driver from http://www.broadcom.com/support/802.11/linux_sta.php

cd /tmp/

wget http://www.broadcom.com/docs/linux_sta/hybrid-portsrc_
x86_64-v5_100_82_112.tar.gz

3.     Extract the downloaded driver using the following script:

mkdir broadcom

tar xvfz hybrid-portsrc_x86_64-v5_100_82_112.tar.gz –C /tmp/broadcom

4.     Modify the wl_cfg80211.c file since there's a bug in version 5.100.82.112 that prevents compiling the code under kernel version 2.6.39

vim /tmp/broadcom/src/wl/sys/wl_cfg80211.c

Look at the following piece of code at line number 1814:

#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 39)

Replace it with the following:

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)

Save the changes.

5.     Compile the code:

make clean
make
make install

6.     Update the dependencies:

depmod -a

7.     Find loaded modules by issuing the following:

lsmod | grep b43\|ssb\|bcma

8.     Remove the modules found by executing the following command:

rmmod b43

Where could be b43 or ssb or bcma.

9.     Blacklist the modules to prevent them from loading at system startup:

echo "blacklist " >> /etc/modprobe.d/blacklist.conf

Where could be b43 or ssb or bcma or wl.

10.     Finally, add the new module to the Linux Kernel to make it a part of the boot process:

modprobe wl

Increasing Laptop Bty Life : Few ways

1. Hibernate: Hibernating the laptop is always a tidier option than putting it on standby, or shutting it down. This is because the laptop’s hibernate mode saves it in the state it was hibernated in, and does not require the laptop to reboot all applications, thereby using much less power.

2. Get some extra RAM: Whenever a laptop runs short of RAM memory it end up shifting to the virtual memory which results in hard disk use, which is a much less efficient option in terms of power consumption. Putting in extra RAM does use more power, so don’t get too much extra, but when compared to the use of virtual memory it’s a more efficient option.

3. Apply energy saving options on the OS

4. Bring down the brightness of the screen

5. Shut Down External devices: Most USB devices and other external devices like external hard drives or USB lights or even USB mice should be switched off and removed if not in use.

6. Shutdown background apps

7. Amend battery cycle: For a healthy Lithium-ion based battery, it is always suggested to keep the electrons that are present inside in motion occasionally. That means it’s never a good idea to keep you laptop plugged in or on charge all the time as the electrons lose their ability to store energy. One should let it discharge fully and charge it completely at least once a month to keep the battery as good as new.

8. Switch-off unused wireless radios

9. Try to reduce multitasking: When using the laptop on battery power, one should try as much as possible to use one application at a time, and should ideally shut one application completely before opening another, to reduce consumption of both processing and battery power.

10. Defrag on regular intervals

'Microrings' - Ultimate Wireless Communication

1. Researchers based in Purdue University have developed a miniature device capable of converting ultrafast laser pulses into bursts of radio-frequency signals, a step toward making wires obsolete for communications in the homes and offices of the future.Such an advance could enable all communications, from high-definition television broadcasts to secure computer connections, to be transmitted from a single base station, said Minghao Qi, an assistant professor of electrical and computer engineering.The team fabricated tiny silicon "microring resonators," devices that filter out certain frequencies and allow others to pass. A series of the microrings were combined in a programmable "spectral shaper" 100 microns wide, or about the width of a human hair. Each of the microrings is about 10 microns in diameter.

2. Thus a single base station would be sort of a computer by itself, perhaps a card inserted into one of the expansion slots in a central computer. The central computer would take charge of all the information processing, a single point of contact that interacts with the external world in receiving and sending information."There is no end to improvement......as i say.....just when we thought WiFi is the end of home trouble shootings for easy connectivity...this goes many steps ahead.....

3. Thanks http://www.new-technology-world.com